Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf879081377dbde8…

MALICIOUS

PDF

90.8 KB Created: 2021-08-09 18:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 885e4fa54001d60778ac17e34487f93e SHA-1: f5ed0c92b4c9b441f43d30c619ba5fd6569568f8 SHA-256: bf879081377dbde8cbd59f6fd81be6282d103b5ceb71915aca7ed85947a18516
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' lure and callback phishing indicators further supports this assessment. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=free+target+shooting+games+for+pc PDF link annotation
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d9ec1502396ddb681b13c3b113685e9d/mufixabodivexugozugibeker.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a37a693fd2866adb66caa5aa7e4c5e9b/57586234680.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a84029d0---53582861538.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e438574e787---33390372718.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/sibewelanupunaz.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/finegisugazolipa.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cd3846eccdf8a6454614338172a80d20/16467525080.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/16266014360e774439d2fe.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a254cb36241---12655381146.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/62701797539.pdfIn PDF document text
    • http://coffee33.ru/archive/file/31595530246.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/51913693636.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e38cfb2f287c6813f2313207bd8fb667/zotokefarofide.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/861674d0563215e2612b95068c026d60/18056792856.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/68057845343.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4599124be---49431462403.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb6d1c285c---9277137632.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081dde27bed7---51867647418.pdfIn PDF document text
    • http://etre-belle.su/images/file/dudebabigubujawonofa.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/widowetajofiganubamolor.pdfIn PDF document text
    • http://learningkey.org/userfiles/molitomobekokivusibowe.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/25754162486.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/47915031919.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/gulepixejubegudaji.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_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 10856 bytes
SHA-256: 12d83b6a1d397097fb3f5749c74ba7bea37e7038130da07131f68386ec74c70a
font_01_sfnt_off00011844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13056 17376 bytes
SHA-256: 99814c7344e479938ab7c73bcc0223f487aae9e464a529b28d23e20d1ce4c274

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