Malicious PDF — malware analysis report

Static analysis result for SHA-256 a907d720705d5ef2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 22:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9ad1002006a2b9411df22c1e3730192 SHA-1: c7e323116e846dbfbd11166628dca8a1dfef4e64 SHA-256: a907d720705d5ef2072067ee6e04ad410445a642b32f5307e30900a1a4326748
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, a common tactic in tech-support scams or callback phishing. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://anhuifan.com/upload_fck/file/2021-9-6/20210906151527478331.pdf In PDF document text
    • http://zdrowejaja.com/Upload/file/tirizudojapudojesukus.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d509213c---gurezuzagepaxefopagesar.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/xisoxodofez.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/t7mjcb7767sv1m57gkeuvhtbng/saxuxodutudusaxosozopi.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/98793510991.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/kekobofijesobitak.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/zexoxuruwazokufizo.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210902051045.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/pozika.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/11822222188.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/kavegimixerediwetewobawor.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613116129de4e---gopekikukaligufizazukuzi.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/13824145126.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/49623866849.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/nuxutenudino.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/1167205209.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/1148419799.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/16159182688.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/taketalufopig.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d7c4c9e3aa0a3efe89eb527b66b99d0d/17907122485.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/setulodalo.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/16959545177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=quit+quite+and+quietPDF 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_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 10112 bytes
SHA-256: 0f811f53be8549e91f10edd9f319d1aa68e5c741c237aa4f630f375852e3014d
font_01_sfnt_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 20388 bytes
SHA-256: e721930c5491a119122cd6b9b8d6fa7f8b86defb1c664901c0b2c91e66ed28a2
font_02_sfnt_off00012495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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