Malicious PDF — malware analysis report

Static analysis result for SHA-256 781b10edcf9b4a5d…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 21:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 296246053e8682e74c2eb19457c8867c SHA-1: 24a07bc5f8d2cbc5ae7e7330a2dfaf8bd29e6b6c SHA-256: 781b10edcf9b4a5d8b54f32da9c2bcb454b5a55ee8a40f1850430e39b42ae42d
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1055.012 Process Injection

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It impersonates Facebook and contains numerous links to compromised WordPress upload directories, suggesting a credential harvesting or further payload delivery scheme. The presence of multiple links to disposable hosting and the use of UTM parameters further support the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=yamaha+psr+730+manuale+italiano.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3228134dcb8c09667b0698670dec5cec/juvixapove.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784bb28fb34---gubapolebukujemuzopu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac4dc69ee---bigupezulafijufax.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/17158456117.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/48997294848.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/larixakofutevesotizine.pdfIn PDF document text
    • https://grandegroup.net/files/xarexadorajulebudifaxi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b5c871b81---bixagifetopuzirekitoxolug.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098657ce00fe---xofopoxanivakeje.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/36977006958.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/b6fe5938ee1bb3807edc8a2fd700a7da/10432222514.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/lixutogafemipotomotivikoz.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/66427530635.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/ninoza.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202108240507529320.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/976c116777a0621352b02654ad119e36/kedareruronojepojikekodep.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b152afd20df3067a3a7dca6806fb4c92/57245968277.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gjmnv4l6m71cjsfvmjdns1jca5/95157662639.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/terudenelokepunuranexen.pdfIn PDF document text
    • http://bienbao.org/uploads/files/29983786344.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/72609261168.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/fanopelokor.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160eca3006b5a0---75769321739.pdfIn PDF document text
    • http://envigest.cz/upload/file/tedituziri.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f25f1afa55---5637501713.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/givozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=yamaha+psr+730+manuale+italianoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD19 18184 bytes
SHA-256: 559492b3dfb643b0ffc31ee8eb9e5baaeed131d625b87c0805357e7d441cbe13
font_01_sfnt_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C0 10944 bytes
SHA-256: 3cd6ca2ab54b32209fa650c7e8fcc0c3297a484ad184f38155949ef049a77a9e