Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01978d0da6fd5b8…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 19:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a43148ad1e225d9d26dc697b7d28bd0 SHA-1: b723741f73ffefbdf55975a49daf3cfbeaacc96d SHA-256: f01978d0da6fd5b80240d7ace57d0bede14338e22d4a1900cbaef952a1eda108
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous links to PDF files hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to trick the user into initiating a fraudulent transaction or providing sensitive information via a phone call.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f9403875---pujaxobafaxibalulufebe.pdf In PDF document text
    • http://bright-inter.com/file_media/file_image/file/59343539366.pdfIn PDF document text
    • https://togeltop.net/contents/files/6529278506.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/34773283560.pdfIn PDF document text
    • http://tiquital.com/documentos/file/69271603524.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/mipeduzomejerigige.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210912212406.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/febatinidafimerag.pdfIn PDF document text
    • http://dhf-china.com/d/files/23353114140.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/rajiletiwevikafukozagusef.pdfIn PDF document text
    • http://leruichem.com/upload/files/ruxugekuzolaba.pdfIn PDF document text
    • http://tercovci.cz/files/file/volakaboratupup.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/zafusejugo.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/2601659935.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/sovadigep.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443c4d7ace6---raxog.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xilusozojoti.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/kugobawodekejiroxufolud.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/58144827800.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dc18c22df0056763d0d774b5fdcbd38d/48307891622.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/22570788070.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc172eed5c---nonenibikipifosepu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09a2e8b0b---17265531075.pdfIn PDF document text
    • http://wawa757.com/uploads/files/wuwiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=moto+x3m+bikePDF link annotation
    • https://lapdonline.org/file/65011357194.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_off0000c1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 10188 bytes
SHA-256: d8bfa7d6a34d95790b82170fad82aef117e701b5fd649a230a29b646817e3519
font_02_sfnt_off0000f0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 16720 bytes
SHA-256: 04d392551fd5d597765a81af9f4ee917de6f0d9494c1b5bd93c5a05f65ec0b3b

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