Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30979bdcb4a3fc8…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 21:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e1ebe78bf63b2e3249b67571e7ae6e8 SHA-1: e5f70540032fcb129f9a17154a9482d243342f45 SHA-256: d30979bdcb4a3fc89e011850ef7a3f6db3c8ca4875f3b017e1ab22cbcf8aefb0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to potentially compromised websites hosting further malicious PDFs. The presence of a 'Callback phishing phone lure' heuristic suggests the document may attempt to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/61447df21c61a2846d4114a8e7b6a809/54353802520.pdf In PDF document text
    • https://binhvi.com/upload/files/49510711154.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b11bf3cfaffb266a167c52147ed8db1a/lefagotubux.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/pogurotezasifoxe.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/kotamuzode.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5e69e44d39ef74a7166af7689e0022fd/91599664534.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7f54c421ba97bc25289991a7382bc1f3/werumodesirarujubetul.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/klch79r6o59btjltpih4muo3qs/79216283977.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/zafumaraluw.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/lawofin.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9922af2fe---kalijafasu.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/75921129689.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c5a94ffb---75562459816.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986138800d4.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/8f4c5a6c408d78c477d5b1ef162ee3fb/33052289401.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/42029806467.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/81577851072.pdfIn PDF document text
    • http://nprofit.hk/userfiles/13930243257.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202108101148563525.pdfIn PDF document text
    • http://ekotronic.eu/files/file/45012336389.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/besusebafexisetezej.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/e1dd156001d0a9c8489a4098fa394803/94869123392.pdfIn PDF document text
    • https://iword.de/userfiles/file/bifatanigixobexisafotopo.pdfIn PDF document text
    • http://vladekoservis.ru/files/3654056130.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aac775e5d---2436976711.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/kudujojex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+xchange+viewer+free+download+64+bitPDF 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_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 11228 bytes
SHA-256: 3a22e4993ee2b02dcdbcdfe2e138dc7670a8c993f929b7a1f1155c7131790cf3
font_01_sfnt_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 18948 bytes
SHA-256: 40697d9a86019365b07f1904a1c56e6e2b8cb5903b95308351db2177db35e5f9
font_02_sfnt_off00012706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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