Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e8a68fe5842a96…

MALICIOUS

PDF

90.1 KB Created: 2021-07-16 14:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6589a6490031b2133320fd6bbd4816b SHA-1: 8db8bcd44cb16005ceefcfb63e496a0b0e56b58c SHA-256: f1e8a68fe5842a965ea13d02957d46aaafe66f97c5bca71fc2d8cd41c47b6004
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of multiple unknown URLs suggests an attempt to redirect users to external sites, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1643

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00eob4vtn8se64rbp7lbuvjct3/67475253523.pdf In PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/667198d43ccb35e666533813fc0d832d/mijavutasob.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/riwolubavafalafexugizogut.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/51398413417.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/57967054311.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da7850182---fawikegulotak.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/kuraxozazejef.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/xajad.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/jisofepilixomejefatapu.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/93924684864.pdfIn PDF document text
    • http://contactconfiance.com/files/files/bubutes.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c740547ca3---45749637282.pdfIn PDF document text
    • https://ka-base.no/images_content/file/83342741172.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609838940b953---wivitutatefuduwuvegatu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6a6902d0eb828b19518334e43c5a5ed1/ripogewunawit.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/gnic50s2d7m3tgvbfoubtn5af5/68356288015.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/fmhhomsv0arbj4ena26vce49m5/baxewidetajesuzavumogib.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/583e503d8e95243dad12cfc5673eb760/5080967010.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/juzunaloniwusafunaxinilak.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/dejije.pdfIn PDF document text
    • https://tycoonmarine.com/userfiles/files/bakijovotes.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858f8077183---wuwoxikevijajivorexif.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/20488474533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=760+pumpmaster+assembly+diagramPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 19136 bytes
SHA-256: 2e4b899cedd3643b842f9f93b7ac647badb8356feb6b47018826cd6954b59753
font_01_sfnt_off000125a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A3 2800 bytes
SHA-256: 9d2a5966ed8a517f205b9b6e4e71636d0b5c3eb6df0e3cc4547c188b51815786
font_02_sfnt_off00013140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14957 11108 bytes
SHA-256: 57b3a17b02e42bcaaf27625e63cf32ca14963c3c71ce4128b009b53c055bdebf

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