Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef25bd22a3e0956…

MALICIOUS

PDF

82.5 KB Created: 2021-09-09 16:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7563d31810720a65ed9118a43f978363 SHA-1: c5d364ffc3f08133d588661d059605b943e7281d SHA-256: aef25bd22a3e09564ecb73072aa1db12ffc73cc5d71b9d2039deb89485ccf63a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a callback phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links. The presence of multiple URLs pointing to potentially compromised or disposable hosting, combined with the callback lure heuristic, strongly suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cpgny.com/userfiles/files/32163083877.pdf In PDF document text
    • http://alkanboya.com/files/file///gibowegutavakagezuzuvota.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/warolodetiwozekotinotaru.pdfIn PDF document text
    • http://fnathservices.com/upload/file/32231326552.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/36191019248.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/90516981444.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/tetazuvatoraxuginik.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/87427359129.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac06bb169---moxawenuwe.pdfIn PDF document text
    • https://znalac.com/userfiles/file/3230119878.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd6ac315b---wifogavefaruvepepumixumo.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/loragebadorotexagofisafag.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/96442729643.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/17460468742.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/32622886197.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/19133454350.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/6574574515.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/sejunejavebofikesis.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/tuzasi.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/tulewifetezolozidujafe.pdfIn PDF document text
    • http://videlec.be/ressource/file/lunubinuxugorabanomagodo.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/56262221438.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109080722004223.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131c646b5217---3223070847.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/zubatefajokorero.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/13519406489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bioscope+apk+downloadPDF 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_off0000dd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 18108 bytes
SHA-256: 93ef8497a47fafe09fbf11be064ce60dbcbd3c5e18c9bc3c6f1cb63d3099d0c6
font_01_sfnt_off00010c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 10540 bytes
SHA-256: 314fda2b0f25a5d8221c09da391c619678d043b94207f18a810575216525e49f
font_02_sfnt_off000124bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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