Malicious PDF — malware analysis report

Static analysis result for SHA-256 a369259abb960274…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 03:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ef4c236ffe0d35355eccfca75dbd9ad SHA-1: b480eb0b36f9b63f43807480369c76ea9c925b90 SHA-256: a369259abb960274dac5438726b1c4566d0fbc8cd57bf48657467d55db9f95f0
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=soncino+talmud+pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607458919cf11---nisoperesagawedizudur.pdf
    • https://webtechnocrats.com/upload/file/80293616623.pdf
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/wesimijureziguze.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a86652a9---94640272667.pdf
    • https://hoangvan.vn/wp-content/uploads/files/zekimalole.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8e8671273---surejibulivulomodi.pdf
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/kodinifuwi.pdf
    • http://rcot.by/pics/files/rikolorisut.pdf
    • https://biomisszio.hu/tmp/depobopegorelekazotiluze.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/57416433750.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/fdf5d35321fd251a39d3ae5c43f82ddf/lefazogujixag.pdf
    • http://perseverance.cyou/updatefiles/file/68922335089.pdf
    • http://lnianemarzenie.pl/userfiles/file/72030466240.pdf
    • https://gomaihoa.net/upload/files/tosasuzudate.pdf
    • https://tolgyesvolgy.hu/userfiles/file/23271655388.pdf
    • http://abwrva.com/uploads/files/gavivonivadukubuguzorug.pdf
    • http://sinproval.it/userfiles/files/karurafezixiwet.pdf
    • http://hndgyl.com/v15/Upload/file/2021616933201640.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e0f0041a---danomi.pdf
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/nusagaf.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7525118c94785c76e777e8ce15e625c8/66829948262.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c8970c1b410---54845111099.pdf
    • http://hotelgiottotorino.com/userfiles/files/26487200071.pdf
    • https://eltechma.com/zdjecia/fck/file/47534535669.pdf
    • http://yokohama-model.com/userfiles/files/46568813287.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e9.bin
b620d50322f407a4d21959c41d84503539386dc6e767ecc0d3b8b11ac2b1c593
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 18172 bytes
font_01_sfnt_off0001121b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 16792 bytes
font_02_sfnt_off00012a32.bin
8b99f80dff8d6747c62cca4adc1edcfc031f929604de18afe8575e51302a5d59
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 10556 bytes