Malicious PDF — malware analysis report

Static analysis result for SHA-256 af66781dbc12c849…

MALICIOUS

PDF

86.8 KB Created: 2021-10-09 09:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 586498385d5dbd05169c3afed292d2be SHA-1: 58f513242c17fa1c419609cd86ca12f464ec13a3 SHA-256: af66781dbc12c849f63dda53af561470a0fc12ba1fe91c719b20d9e5c670959b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it's part of a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in phishing and tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=oligarchy+definition+history PDF link annotation
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16152a4f160360---menilupikidipanuma.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4cfrj3g736cvpmtc1mj589hr00/xifobemobosib.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/wafadube.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/74699256885.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/55335220178.pdfIn PDF document text
    • http://attlas.center/userfiles/file/kilolepesi.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///35040114627.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cce1178fb---koredurijaxaxinawomo.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/jaxoxalaj.pdfIn PDF document text
    • http://findacommodity.com/upload/file/zujowagovexisigo.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/10/04/file/63223757457.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/zepiwokoxur.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/vomigote.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6juheceg91g2p9ujb90qccnlv3/70840543614.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/28401623160.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/bb9ebf1693768a782a7621033ed37849/josem.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/63836385135.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/xajela.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/miwologesifuwefevi.pdfIn PDF document text
    • https://webmanagement.gizicsarda.ro/images/file/70068317810.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/53993666354.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/92718454706.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/vuvufetujizoweju.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/tomuduzani.pdfIn PDF document text
    • http://stroi-sistema.ru/img/vitigisoge.pdfIn PDF document text
    • 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_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 18140 bytes
SHA-256: eb5a366954213e845e4efa335df86b31dcc5387c38bb36326f45aa28ba081e9d
font_01_sfnt_off00011c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13493 10896 bytes
SHA-256: 6596ea84ad06a04e37c30540c52bcc7222ab307709a8f21034ddf969be63abbc

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