Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a08136cf485abd…

MALICIOUS

PDF

81.6 KB Created: 2021-07-07 03:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5284f980e91173ea68130f2f601b173d SHA-1: 7e3e80c34d8a01338eed307f014d160075357211 SHA-256: a0a08136cf485abdcbd7e853e57000c7ea9ed4309e55fbe32379fa251fdeffea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. An embedded JavaScript stream was also detected, suggesting it may be used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mikailang.net/userfiles/file/20210502035148_1919942298.pdf In PDF document text
    • https://stef-nancy.fr/upload/document/jabumijejobavil.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/rpadb48qnl728m7q25gbf7o523/34054906288.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ece6e2f3a---zoriwugisofuleralin.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c85162d8c67---zusutodapal.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072816ce7ac8---sudibonevinas.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/bowivovuki.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/dc75f70d5eb1af0e90bd3f38a97b3538/refatefunuxoxitemupu.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/87854672029.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12b8e80693---zezesozugebugumezasogar.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b49641acb---13240226986.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/fanogigepegobufabugu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/065qvtiiulksprand6q7p121nj/nedikowoguwe.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/58202673747f24f533d3b150365ce27d/venorolanasa.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/sodawe.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085812b05313---tadusenil.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/bamowef.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pig4vqj2jd7crt3s2o9nf0a5b0/geriletuwop.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/fikesivowaw.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/uf75hasbfbrv0nospge2ftfs6g/58710478205.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/popowavivupo.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/geralaxazerafum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=a+kindred+soulPDF 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_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 10152 bytes
SHA-256: b41af1604c5ec5b2c3b868761cb2299599143a04b26b4cdf06c90a197267db91
font_02_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 17528 bytes
SHA-256: 7e2fb0a9705f6bd7341f2b33a1456505339cdb4cbc20419810448010561ce029

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