Malicious PDF — malware analysis report

Static analysis result for SHA-256 7471f83ff5de32b3…

MALICIOUS

PDF

96.4 KB Created: 2021-09-07 01:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d733b882c793431edd6f59b44cd92b4e SHA-1: f1f7e96341ff3b772bf6235f1501a20d4460974e SHA-256: 7471f83ff5de32b380fe71bc49763eb6c842dad1877e5c7aea9ec1f83cb0d3db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external PDFs hosted on various websites, many of which appear to be compromised WordPress installations. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ptichile.cl/userfiles/file/zuritanaloderujufilovomiz.pdf In PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931fc9993eb---87124204955.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc01684465---bomitirarapuve.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/3b193c521b9f222e8bbab6f2e41cb9df/kemusep.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052505381373499.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/wikugakolexosanuji.pdfIn PDF document text
    • http://moristas.com/userfiles/files/364363185.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/fexipixe.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/xabitodojazapilapitatasev.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa99781e291---zenifefojosume.pdfIn PDF document text
    • https://ekransamara.ru/files/xekigugibifu.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/niwir.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/nopitokogaduwifolo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/cgu0e35ep1kt1j1mq86uaopol8/83828990028.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9130a9c65b---1221130110.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/50561436074.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611b1b264e856---11642626219.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/45971225459.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/12931868551.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/44e588b937ed86d12baced897df2cc00/bivozafexusujexutus.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/34153121343.pdfIn PDF document text
    • https://khanikango.in/file/bopufuruwonatolinosa.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/jekiwifib.pdfIn PDF document text
    • http://indel.sk/userfiles/file/wefapomadirejejovijidusi.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5abbec4396c2aa8d2448da24faa4ba43/80083079935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=components+of+gdp+pdfPDF 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_off0001149e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149E 10472 bytes
SHA-256: 7a081f36e303239916cbc6cb2e8ccd8cf1332fe02866bddf98d5dc5567a4a35e
font_01_sfnt_off00012c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C31 18520 bytes
SHA-256: d8f4c88417e1a35e257de8a7f88246dc7a459494ff5aa01f6534a74ad1c38673
font_02_sfnt_off00015bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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