Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7ef03620d993a9…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 22:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bd1c97de0733ec22a16eaa52ca188649 SHA-1: 40b4a1d556efa309a80f895e726ed481647e3b75 SHA-256: 5b7ef03620d993a9e5c3a490489135a21796abe8e82c1eb72a0afb4cab494aa4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting the primary function is not to convey information but to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://effektfilm.de/files/file/topidovudawuvozonunod.pdf In PDF document text
    • http://jtylek.pl/Upload/file/58711761694.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/kikotidoxaxa.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210805_123018.pdfIn PDF document text
    • https://rafautama.com/uploads/file/7307354141.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/ripolisopodebesoletat.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/doxabaxodenifizolijorodu.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021051907312264.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/11232139744.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/cbbe34ee6f25fb012b44abf23e798206/kerubazalexalosuf.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5acd7bb0aa---90545990232.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/bd09905634a493db770248c8098f70fa/97146496710.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/bitinajuvupujizal.pdfIn PDF document text
    • http://17njl.com/userfiles/files/jaxujabu.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/misudefomajexo.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/966cd0ad08e0ee9b588530f16dafd2ac/rodozotemigizajukosim.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/51495232229.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/0b4up3bjkch6ujvpik3ki1bol1/fegezaxumesino.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c774269f9a3---55558912953.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd37f0c93dc8c3bb5c431c3e39b2cc9a/jokivaralomunuzenaga.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f190dba7f---vimafipasuvuvutidanenule.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/genufefu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f226cb2dc---ponamiv.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/57995989228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=grados+brix+frutas+pdfPDF 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_off0000b652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE64 15228 bytes
SHA-256: 6231f3089af98126e4cb4d81fe0e2295883cd1d8cc2f7d5a58c12eb33e1900d3
font_02_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 10588 bytes
SHA-256: 1e6c41b0719056f33a1aeddc9c7645790f7e5e34c8066b9b4c5460f2d6d52fc5

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