Malicious PDF — malware analysis report

Static analysis result for SHA-256 14dc2080a1477a3b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 15:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 170aa90598101eaa9319607f4fecf339 SHA-1: c295f241be7b5c3949340efaf8bea5965ec50b6b SHA-256: 14dc2080a1477a3bec0d88c398bcc6a3e5cefc69d8349fc50e2770fd02d2d746
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing or tech-support scam. It contains numerous links to potentially compromised websites, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to deceive users, likely through a lure that prompts them to call a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://beijingxinzhi.com/userfiles/file/20210720231306_75516295.pdf In PDF document text
    • https://kurtwohndesign.ch/userfiles/files/80249740673.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/90496886349.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/zixuki.pdfIn PDF document text
    • http://thecuriosityshot.com/56200887694.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/rotibezorafub.pdfIn PDF document text
    • http://mav-auto.ru/images/file/36177762287.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/namivabipezonuginegeza.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/214f287138c37b3e4c9a944f43330817/sipisasutavibex.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a01485c62cfaf39e7ac24eac8267f529/74501154253.pdfIn PDF document text
    • http://elitk.ru/_files/dedeb.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f778301af---95882378063.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a67825293a---tokoleju.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabd5c8c38---nuwukupela.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/7176039857.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/91645759855.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/69063065514.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beaf803c66a---morolijawotamuxuso.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/48615079871.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160870fd00a68c---nuxibigize.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/daxosokuvu.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/73262940158.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727feea5e8a---fodogesi.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/panil.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/jurumedalorotow.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/ce2053d59efce5df89a04fb8ea373f93/92705863826.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/74684425465.pdfIn PDF document text
    • https://www.jollylearning.co.uk/free-parent-teacher-resources/grammar-action-chIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=jolly+learning+free+resourcesPDF 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_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 17524 bytes
SHA-256: ad8c0bf09ff5540f20a4a37551472dca34dd40655befc318ff52cf1880b27b1f
font_01_sfnt_off0000ff60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF60 10620 bytes
SHA-256: 7948c2514d5de86814f1dffa6173108ceb33d442b3122493aed7613e3abeb4d0
font_02_sfnt_off000117d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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