Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6483acba425f38…

MALICIOUS

PDF

86.5 KB Created: 2021-07-05 21:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 24eb6a7d1b2f893d799754c7fd5b0db1 SHA-1: 2c8b3d3ae7cfb8b08b3f64c3ed5c289c656cb496 SHA-256: 3a6483acba425f38b2d535d0a91ede897a6ff4ef3ab93339ec499055bea8242d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095a2c3bb17e---38138838703.pdf In PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d048d0244e4cd0f078d6f8d7f234048f/xuwetakedak.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/4b6d2af90126d4f61a1a666dca8edbc1/botosiredidugibajefufe.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/bajetedifunun.pdfIn PDF document text
    • http://belloverde.net/emailer/file/74053900564.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/fdd08837921ec313707289b90c2150c1/xepuwofogom.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/3b5a90d9b2c4d5ef174593be628d7af5/tukakotepomidezax.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/pa4rri34ojahapcv1kl963tupt/tevalegibagalijogejoroj.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f396ecdbe---fanenepokorejum.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609662fe678ab---37162098296.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/4d1d7fba1fe79287a11354c8b9da689b/zalurojozazose.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/92879433223.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ada49d9a0abd752ac38583e3a99ab2e/lexugekelosuxitefifegid.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071d36c42f90---2357585932.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d353d4daf---72887272540.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf458f7f4b9---ronaw.pdfIn PDF document text
    • http://chromatographvials.com/d/files/49550548000.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45bdca4e5---ranevuwikejasag.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/94661072794.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/fitemufuxekukolazulosebaf.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1d506b247---lolufaratobomawebopesori.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/20206306275.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6954c8c849aed61d43b1d9ec64f7b35f/74615333171.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/98914343040.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/rifamizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=kind+of+triangles+on+the+basis+of+sides+and+anglesPDF 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_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 10764 bytes
SHA-256: 0d4ce0c0333da911154c390fbdc31bc010bb3de64aa0daa3ac0d40c8384cae04
font_01_sfnt_off00010566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 17636 bytes
SHA-256: 7ccc28f430544ee7d707f1b654a5c0998b3721090f0a801b5aa81827866aa328

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