Malicious PDF — malware analysis report

Static analysis result for SHA-256 df21a62c2407e425…

MALICIOUS

PDF

72.8 KB Created: 2021-09-20 08:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86bfa26b5f1bc93df929a53562fdb976 SHA-1: 43ba28921e534326997ed464117d8b7d7696b122 SHA-256: df21a62c2407e4256d52f28fa974f4c0bf81d08ae0d96e799a92b5924fb4e1b7
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing analysis of its specific content, but the heuristic firings and URL analysis are sufficient to determine its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://laureysnv.be/uploads/files/ririfexawigijitasaxi.pdf In PDF document text
    • http://buren-kompanie.de/userfiles/files/perizurosiduret.pdfIn PDF document text
    • http://gapp.fr/medias/files/kelajunim.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/49617115176.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/e6afcf4306e276c5166706973d45664c/jukelusid.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/20158213064.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/72734479410.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/foruxuzilu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/25afea1715aef4613bf750f1ac04ae18/ratapugapaderusojifuwu.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/18996208010.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210906032722.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/92063789664.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/rurujafuvujusuvuvowus.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///66952387437.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/boniwuvotexedogosaveta.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/pumopelurajizudaxod.pdfIn PDF document text
    • http://asustainable.com/global/file/47787384881.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/15605021950.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/siniwodivumegibededaw.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ibet.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/74096534283.pdfIn PDF document text
    • http://schokozentrale.de/idata/82250848553.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/baluzapaxijikemojamomovaw.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135fcd19b242---zipikikixo.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/zoruberakilel.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/30896668438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+set+transparent+backgroundPDF 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_off0000bb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1F 10956 bytes
SHA-256: 5356b4fcebec9d803fe34126141a559aca264d02064aef8131cb0c7f2abc2729
font_01_sfnt_off0000d44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 16256 bytes
SHA-256: e1e56f1844e2ec252bac6ddf06c24f3bad6927b798917bd6d07174254095d328

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