Malicious PDF — malware analysis report

Static analysis result for SHA-256 125fe8bbc798fac5…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 10:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 662ea4e2feac2798aad0689c25356897 SHA-1: 9ab71433965b6155b5db6f43a181830db892b7a4 SHA-256: 125fe8bbc798fac56c84294172cc12e6c1eba191ea66a5c3a8889740c242df73
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest the document's primary purpose is to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://chcial.ru/uplcv?utm_term=minecraft+tutorial+world+seed+xbox+one PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135e52fb9a18---52287594597.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/04u4qvg8jtdkt3ihan8hfiggu5/36937226038.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f8ee96b979e9ad2f2e0ef6102c9f8757/kapekinu.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/81746359275.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/bogexod.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/97247711186.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/406cb9b01dcdbe41b661f37b0c33ec06/96179484265.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/wajibafozitazukikapuloxuw.pdfIn PDF document text
    • http://japhina.com/upload/file/warisix.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/23979144159.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/detujolusimekesuserisut.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/54393060776.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/22226470552.pdfIn PDF document text
    • http://teplospectr.ru/images/files/31963438045.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/gubuvaluketetozomu.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/82589836395.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/62364827247.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/bovezewogopumo.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/vudamapemuwezadozunogi.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/nipibekawofunuvelalaloga.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/86588630084.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/maxuxotegabalaxuvejov.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132674eafd5e---firilokelorumedu.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/66666720127.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/79290325780.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210908_133525.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_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 10888 bytes
SHA-256: 04df10abfce8d838df071d96cc55f6e75fe6ef49e43933813f2c97796e191eff
font_01_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11892 17868 bytes
SHA-256: f84bd1011c5eb63fd01101c7057c14711bd14ebacf8378803f2987911f7e038f

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