Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32e26b86649711a…

MALICIOUS

PDF

67.6 KB Created: 2021-09-26 21:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f65cda05a926ec58b76bdf673003b7e SHA-1: a58d89daf7cde0615ce47f75f7bdbd9dba9f1432 SHA-256: b32e26b86649711aebf09678dc023f7e83fc15e23ed5bdc3373c8dbee0595d1b
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 potentially compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. No scripts were extracted, but the structure and URL distribution point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://thermogroup.ru/uploads/files/datofatebefanabowafi.pdf In PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/61533084707.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/badafowebavawo.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/visusox.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/newazomo.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/kedolibulupafamel.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea44f68f1a---nirezufobe.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/wajotemo.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/56155506955.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hndo96iu85mit4kt23d8l6sij5/86942682176.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/60120104052.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210903120123160.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/nubovedafudamepif.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/89382963411.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/3327680877.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/toweve.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/gurinajebaduko.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/d7df22b0baf5fb3d5eb8ab6e2303428c/7950392300.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/potej.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/lupabupopozugofipakuluti.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/nTLA84oWRVPX.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+do+i+make+a+pdf+on+my+phonePDF 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_off0000ab89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB89 14864 bytes
SHA-256: 71818c1c59270c922cde5da2ad4398663f534a26d6256373711d37b9f21e346c
font_01_sfnt_off0000d10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 10636 bytes
SHA-256: d75e3e12892c89d83e957ec9d15c229a40eb9e6de9e7ce4ee9e01c88ff2dc5e5