Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fbf3ad175a3375…

MALICIOUS

PDF

74.3 KB Created: 2021-05-07 00:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0e08015a9851c15a713b5caa986c3c84 SHA-1: 9489be092b99fffff5a37696c377bc5a8e779b6c SHA-256: 42fbf3ad175a33758b43be4e46868ad6a968c5a20f947b707f22ad7f4961c1f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs, such as https://pixomot.ru/uplcv?utm_term=what+irritates+you+about+co-+workers+answer, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/uplcv?utm_term=what+irritates+you+about+co-+workers+answer PDF link annotation
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/gvkh9rb24rbsfdqvdudhh6pua5/13298468731.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/3uu85vhmjmna62bbga9lb1ir36/mowuritujulomiwepuxawo.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e71ab57fb0---kasagijesusema.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/22e583c4b4949864a7e8a2f9678b6280/81453249696.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e39db9688---58257137764.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2b18a95a2a5c2b24016b7514fefed29e/69802402804.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2b903efca422afded2e269578aadb951/letozuporinifapagojijo.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gepezarudete.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/25dec4f57b638a542657bd9b75169381/94950060860.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/1gf8ffcrv8f6hkmnemfqh4r1h1/siraz.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/29222196171.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d66dd8a6648aca1a4a51a979aaf48550/dowezukokawovulipaw.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafbaa2274---78277121970.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/28869308538.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/99ff7b97cc9adcf48026f46c63c7f021/19938524374.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/57ce91e7015551a39834d8186ec10c00/nomezekiluwugap.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c875cd9ad5c940ecbf75471835ecbed9/liseterusov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 5300 bytes
SHA-256: 9812187aced28271424abcd54e5aa2c0815d3e8b56df0c9d157e88f1bed25fa4
font_01_sfnt_off0000f692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF692 11256 bytes
SHA-256: 214089a95cc938e72677871a012d26f7b31022e2a2460fed7653c5bc9b7d6dab