Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c001a5181a51bc2…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 10:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 789029bd36b74fd0e3b5062aaf8d750b SHA-1: 0cf1fff5726c63816ced901300da3cd8111cff4b SHA-256: 8c001a5181a51bc2a4daed0b2da99f98aab81de811eae78ac1418f780ef45829
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead users to exploit kits or further malicious content. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/mdaj2054rr3p0lir10hflhm3ir/loweguzozedep.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076eae869e3a---94014868479.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/tarenagumo.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d9fa6f3ad---48617054726.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/dafukolix.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/38613712663.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/10331681046.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051919381118.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/40f6d15b6315933575a61c45da893914/45132149855.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/49442624264.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/fedef.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/80057649161.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202108311748088028.pdfIn PDF document text
    • http://mid-europe-ex.com/gefaboredorakaporelazadu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609470d919198---9719374970.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1621351784313978504.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/b8gaan2p5nrgnpg2bgt1erm2v3/96951677561.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/44330379038.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/5fbbd4a46d825b22df97a31e4164d4d9/valelimugomudimaxa.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/95437702094.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/498531eabd6f48878de473ccae1e6fd5/wogikenure.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/fisizal.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/demuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=knee+pain+in+toddlersPDF link annotation
    • http://irodori.kir.jp/files/file/6165899391.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_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 10376 bytes
SHA-256: 209357b00e6de53907bca089dde75f40150d7de17c1f7472f2b26783989cb7b1
font_01_sfnt_off0000fbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 16848 bytes
SHA-256: 1c27ff3cd7f72eb2d9fbf90411015e31f1da3486b283378728b23918adf38a5f

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