Malicious PDF — malware analysis report

Static analysis result for SHA-256 576c8dabd96ed57f…

MALICIOUS

PDF

99.0 KB Created: 2021-09-05 08:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df9e670f85f767f1e86cfa1c6289fab7 SHA-1: be3b08e9e6ee3329c90719eff5a73f21598dd6ec SHA-256: 576c8dabd96ed57f8febde53bff5168106ab541fd0ae1c27d7cba520fdbacc55
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised CMS upload directories, suggesting a tactic to host malicious files or redirect users to phishing sites. The presence of link farms on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8c438d53---84325745464.pdf In PDF document text
    • https://armagedonspedycja.pl/files/file/mogavazezekewuxuvusoret.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/22336073548.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/53389075987.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///7000154066.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612521bf56dd7---wafugomenevifu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/t0vo7o0u5js2fvb941aitqtamk/mutidivokabuxipabixil.pdfIn PDF document text
    • http://erictex.com/ufiles/files/rowozujaboxit.pdfIn PDF document text
    • https://btegypt.com/file/82076656721.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/27690745122.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/werotu.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/62910640284.pdfIn PDF document text
    • http://chayka-svg.ru/files/nibulaxemozox.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b301d936ff4---bamikuxu.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723e1e8bb87---64571822823.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/webena.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a824c18bb3a9333b993482e57acadeed/rakaxekuk.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/66649430701.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/sidosupaxudemiguji.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/xebaxoxakijad.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32a2aef68---93826248569.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e3d0a05a8---94643394970.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/79254451107.pdfIn PDF document text
    • http://bscartridge.com/pic/82357547936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rhythm+music+and+the+brain+thaut+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_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13177 11116 bytes
SHA-256: f15dcc4f72c706a6b8819a23f9858d558c84f4fa38d07e4a33c9878f54d0d57b
font_02_sfnt_off00014b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B08 19452 bytes
SHA-256: 4e6f6b10a1a4b6998a8206e49dc2cce41d21e661f7de5c2064a64887fd8b8025

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