Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc4783a7fcfcd6e…

MALICIOUS

PDF

96.2 KB Created: 2021-07-07 16:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13fd8e97ae7eeebb76d2c4340bf9d874 SHA-1: c1f0b1308cdbecf1183540c78794ffefb719095e SHA-256: 5bc4783a7fcfcd6e2bc07d391939fad09c09c222eb4ffbea17adeb4fb8e5a58e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage, specifically WordPress sites. These links are designed to redirect users to other PDF files hosted on disposable domains, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/053ddc95225c09f4ee9be036da91a05b/wetafobiva.pdf
    • http://verduciautodemolizioni.it/userfiles/file/8203636430.pdf
    • http://caratow.eu/userfiles/file/genedizoniwofa.pdf
    • https://gregor-biffiger.ch/userfiles/file/lowunifad.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/27064ed282cdc55dfa90c1a43938dcae/98631652499.pdf
    • https://angelsstaff.com/uploads/file/movazonisiwipokimemuvibo.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4e2de26a18e51b0ff5a1c58a920acd96/gokepazalanuwupesadazuz.pdf
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/59758192923.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16097f211b89a1---xavoxap.pdf
    • http://aardbeienfeesten.nl/uploadimages/files/mapar.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0ea4b591ea7038989141ac5712af3be0/jogididexiwowiwiziporol.pdf
    • http://dungcucaytrong.com/images/files/2708528909.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/gedunuritulafizig.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a86b9f66cda9a386c1fe92c2f817fa7/4361236419.pdf
    • https://marblobaths.com/app/webroot/img/files/68830075317.pdf
    • http://zonazero.es/userfiles/file/zixevatut.pdf
    • https://meesens.be/KrMee/Tekstverwerker/liwomabopenokexin.pdf
    • https://larioenergy.net/uploads/file/72922508638.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/2201074616.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac85cf73d---vuratomomupud.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/geini3dor113laides0vh86545/dizasid.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/459e9ddb51824f040da99dcc3066f3c4/41868725831.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=kung+shee+fat+choy+meaning
    • 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_off000113a8.bin
3aa36ea560e60947d633e5b9a1dcc8b598cbcffbd64201878d9b334a5f0fadeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 10840 bytes
font_01_sfnt_off00012c92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 16792 bytes
font_02_sfnt_off000144a4.bin
3e66040fd6209e3049bdad84f6e928ffa82517e8408dc2669759f224e9341154
pdf-font-stream PDF embedded font (sfnt) at offset 0x144A4 18212 bytes