Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f4566e5f47caa7…

MALICIOUS

PDF

109.9 KB Created: 2021-07-02 07:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f00a6774d5c93d77154b39d5c7aec5d5 SHA-1: de048639e69e27fd7c2e5fec96c51e1ccdaef60a SHA-256: 37f4566e5f47caa733aff104c9b57f31d816ec952f72713401092e52329a0e99
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories and other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malware. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 6

  • 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.
  • 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://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a3017aed---zekanonoxupurafojap.pdf In PDF document text
    • https://gelblighting.com/userfiles/files/78304016901.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/99911577199.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/cdjv0mabg3toc9hfgh1pv84in7/92239095849.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/63217927429.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/23864877000.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb81d1ad8b---4540662115.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607604fa9e9f4---kojubapi.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a2b6c3c1---paleverodumitem.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/96617583167.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6fd0f7d51121607b1b1b94cacd593fe4/waladogulijanuwaxa.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/b0243343c5a3e6dd7bc86e1a04d5f473/987531293.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/jaretefotex.pdfIn PDF document text
    • http://edgecs.net/documents/wamigupunun.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838e54ab1de---30475374164.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/29752407141.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c541a07cf0e---rasofawedovujujamevatos.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/fejuloxudo.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/olimizuworedibujaf.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/xufidurusisijipetaz.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/voper.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26e578df6c---dikadoxilupoza.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bfs1vjpnuokp7m96kn218cjt31/14505028803.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/tedoq5vhvlrb1pls7r387u9co4/62996693804.pdfIn PDF document text
    • http://carsonandchain-ip.com/userfiles/file/1452485474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+does+liquify+meanPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016492.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16492 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 10872 bytes
SHA-256: 89f6c72f89e8f5c881f870fee4d7ce08206b6e12c4c9cee894f1430732523cae
font_01_sfnt_off00012977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 23780 bytes
SHA-256: ce947eaedd12a9b36a710f018f8d644d4d2bc38de5a5d7c36b04a54914cf93ac
font_03_sfnt_off0001822a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1822A 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_04_sfnt_off00018fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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