Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94ea13f4eee2b96…

MALICIOUS

PDF

75.7 KB Created: 2021-09-21 05:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 167bfb4e8ad290f19e9abefbc856dd14 SHA-1: 8ec953d81f1da08e09370511765b61353f356080 SHA-256: b94ea13f4eee2b96e14ecf24c183b48a0b667931604d00a8765de54777f9ec10
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The document body is heavily obfuscated, but the presence of numerous external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ankurgroups.com/userfiles/file/11762964218.pdf In PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/233104751.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a51589e1f02a8017678e49c6416475dd/futuponalopexudela.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/21s1f5dhqrj4m46aqplkei5j5d/nijediwilozurodujadute.pdfIn PDF document text
    • http://onlineauadms.com/ci/userfiles/files/tipalupuzuxuwibobazif.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/wevakuziz.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/tepofasatidumeluxudubo.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/teletig.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/zesininoxomarugejixedidi.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/071420562533.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210915224933.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/164bf20bb511a62f2489dd5c1a827d09/22528887032.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/j86jhmqps8bv5g6kjjjq24j4l4/xolepu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b8e4f45325298c070a386df1e0d5a0eb/44733048743.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/zurokepovexivinexo.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/labewuwebulo.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/jopunilosop.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/vigurodisagabajeku.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/92665012649.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/tusabaposaxonugo.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/94142581457.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/8396138873.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/70990111880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=among+us+phone+wallpaper+livePDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/xonakuwotamebet.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_off0000c243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC243 10836 bytes
SHA-256: 7d35147a39363905e547c5bf7ef1308df1db1a2b1d9be9de1b4b68b70c4d337a
font_01_sfnt_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 17980 bytes
SHA-256: 7564ac068bc130555d4fa08156bd6431e0db8534b86cbdaa61d6b23a010cc8b3
font_02_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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