Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ab334abcbb6a47…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 20:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1861291d8fd7d109a780cb1417eda91b SHA-1: 4ef2523dcbba45d916fce8010af793a7d573f3c3 SHA-256: 77ab334abcbb6a47f0e944e5b9b6924ca2baf8af9d543eebf2fe01c92bdf0fa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it functions as a link farm, with many embedded URLs pointing to various domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of compromised CMS upload links further supports this, as these are often abused to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://fatimaartwork.com/userfiles/file/59847038216.pdf In PDF document text
    • http://ktai.lmg.jp/upload/file/musupuligekijefaga.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/68156373553.pdfIn PDF document text
    • http://ustunongel.com/image/files/bimevoxezu.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/zepufekeribarelusenoj.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407fac4d98e---fuwakuxobonavinasowodebu.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/romaxevuf.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/vowuzetiwiveporimexalugog.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/45678761453.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/lesasejufawukopinevel.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/14688455140.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/68533321269.pdfIn PDF document text
    • http://119pump.net/d/files/77629832869.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/66011783560.pdfIn PDF document text
    • http://xn--c1adbeke4asdefy.xn--p1ai/ckfinder/userfiles/files/27518696900.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/73089685230.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/roxonujojuvadowalu.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/299656994.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/oeth22q2010645m0i301og0dug/wipepupefitadoropokix.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/xibudaguxikajobefu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4c594eb3175e200a494e1f17bd94a4d9/sujesibojatusomewiba.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/turixuruxawupenatalegup.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/dituvumemejanoduraw.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/jugologusodomerirokogis.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f06cecf45e3ef973de564699b1d3c0e7/84301090333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=latest+utorrent+movies+downloadPDF 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_off0000b448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB448 10616 bytes
SHA-256: b6dee0f37b2f39d4e49a4beacd49a2f370c624e801fc1021a59490280b06576d
font_01_sfnt_off0000cc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC97 14560 bytes
SHA-256: 8df11e5065a84cd3184be224ef0a6d340ee7995c808ad0ef68ac0c32668d332c
font_02_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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