Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b87dee903d37834…

MALICIOUS

PDF

101.9 KB Created: 2021-07-18 00:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81181fc56af39ba246e1c7d8258e0036 SHA-1: 0ddaafd43a98159d72dd174db7a54360e3f7a462 SHA-256: 7b87dee903d3783458c3232fa7f85623b89c6954ba045a61b5ca3b7ef4c8223e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL findings point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://ototavandosemesi.com/resimler/file/94293907006.pdf In PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99e05ada9---93918335459.pdfIn PDF document text
    • https://preciseenergygroup.com/media/ragugijexaposuvawivadofe.pdfIn PDF document text
    • http://evola.it/userfiles/files/biguxebokilubegekixi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609010911b685---bodezajepivenumutid.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ec6f3854910eb7c88b670f8e7eb51acc/livulebaxijekonadepuw.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/refifiwa.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/16953158907.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160bf29f2831a0---53169479677.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/nipipukepunijajonada.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b147dc4e78---32357742278.pdfIn PDF document text
    • https://noddy.nu/images/file/pepubitarapi.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/nuxudopefaxiv.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/jipaxurovivesona.pdfIn PDF document text
    • http://labsshop.com/d/files/80155690946.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58667217453.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bca7e328513---13451572071.pdfIn PDF document text
    • https://realschoolspirit.com/scauserfiles/files/jexelavuberugagafirafe.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4680c1253---87669630272.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/28652311299.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de8a4a3bc11---58437990262.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb8fa13907---jatewoxegivezolubapanop.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ae1d0b087---40584198846.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/kilinifinezixuxoz.pdfIn PDF document text
    • http://tianfonmm.com/d/files/vizedojirewatixono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=calculating+square+feet+of+a+circlePDF 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_off00012b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001438a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438A 10788 bytes
SHA-256: 91138f7c1bef978059320317bedd3cd45cf3ef8315d01e97a4d1ff31e9ff1f0f
font_02_sfnt_off00015c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C3D 17740 bytes
SHA-256: c97bfbd06d38a776dfd8157cc66091011ca20d15291e5b8b7b77b2c813dcb971