Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30344b8aafcea4c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 14:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54b6a2b0004afb621b41e91b313e14ea SHA-1: 132f4964b9a8588d5d0f08e406dbda6412612c3a SHA-256: a30344b8aafcea4c7aff29586ac5417b83e4ef372e3aea4f4e93e7578a0df7a4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress sites. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://snpwachq.com/files/js/ckfinder/userfiles/files/80679471669.pdf In PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/zewepixajeso.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/53741683548.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/wofedoremem.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/xanewimipulesubafimis.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/94566924915.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/xapekuwekoxixemopener.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/polisudilaw.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/7d5d1c6f30428f1ec746e1bff780c0fb/jidexopozu.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/bubisawakufafijulu.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210910155109.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/19840473172.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/panatuwazubopen.pdfIn PDF document text
    • https://linker.tw/files/66909230565.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7a0d2b16---vafujemilesotewaxujomoxak.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/resimolobikovu.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/70469584622.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/norupowi.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/sujidogotu.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/danirotowebasovi.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/18102518472.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/10f6f6b5baade7f7996f520c23f229b7/jufunobekag.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/lasaxibisetabanemuj.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/27455148469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+disable+emergency+call+on+androidPDF 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_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 17608 bytes
SHA-256: d4fbfc424ef0f747ba6f8ac0867fb46a1d2a8536e931b40e2a89297af8854a0f
font_01_sfnt_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 11044 bytes
SHA-256: cc2620f490ca44b7ca3ba6d8bb8eb83727e64f561e3b3fbbd7ac7cc9b5854dc2

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