Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbe41a6772e9829…

MALICIOUS

PDF

73.7 KB Created: 2021-07-06 02:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21ac75255c1d3c32984edb4aad074d7e SHA-1: d91bb095f0f637abeefaccc5af87d7a9d8011cf7 SHA-256: 7dbe41a6772e9829b302bce525d9929d1220673bcec4410a1c076a117dbf79e3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts the user to call a phone number in a context related to billing, refunds, or security issues. While no scripts were extracted, the presence of numerous links to potentially compromised CMS upload directories and disposable hosting suggests a phishing infrastructure designed to host malicious documents or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3d02e56ccce5755a8261524bd2c35f0a/nimivapakizapub.pdf In PDF document text
    • https://senhewood.com/d/files/vexumitumopobaxibi.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/156e2a160c363dcb227ae9ac3ef5d5ed/wugaki.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/94791242074.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5cfdb189f---18643710263.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/17155505181.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/ca276ff457daccf878e86afcb89c8be7/65506644307.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a1bc56ecf---6633385213.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/pixuxolavizujotupusumato.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de8d047d1---62667235546.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8668379da---tuvejutivoguxojep.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/51375151781.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/tuwuvomuvovesolasanag.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160904972d7871---pumipulexemozodigimo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725f6390eee---63371268295.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4cd37690802945d1b32c463f54d10d19/walakijasatuk.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e53bf017a8---vijomez.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5c407a67f565bef1a761b25277d68c8f/lamesim.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25e57ca857---mutap.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609850813675f---92567844188.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad8c5ba69---3521333681.pdfIn PDF document text
    • http://patroha.hu/file/45939626189.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7901b24c6---30127869199.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e3031bbb6124fe2c4b0d0c9c7a22389a/xokupekepukawuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+check+illinois+drivers+license+status+onlinePDF 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_off0000bf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 10800 bytes
SHA-256: f6d31a8c60ef527318305c610adf09280c2bb14aedd63c97811a130927f801c1
font_02_sfnt_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 15960 bytes
SHA-256: 76309caf11cf71ae0cc8fe50eff56e718209564916b01f1f380eecd199ac747e

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