Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2a3c7601d9b875…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 21:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3951468235065b7ed6cab5ff3f96ab64 SHA-1: 2c46b8f00980f60ccb3d0c045b97017e0e556e8c SHA-256: 2a2a3c7601d9b875a8c0bbd5e3461a1825ec07e341faaddd1eb35ad31ccc8589
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and embedded links that point to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious websites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=biochemistry+stephen+stoker+pdf PDF link annotation
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ecb4e133e6d533eaca8721144321899a/67185085558.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/pufobunukaritixivuku.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d831c689a8f1b65cab1468ce1bbdd0bd/71812383901.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/wasepexalexe.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/3774055256.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16120142111a0d---26303396791.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/90316547928.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/20294800960.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/zukokedujira.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/pogamosatetisewulibinozi.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/65856068676.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/nezadevapelawak.pdfIn PDF document text
    • http://erpos.sk/data/files/banigamozufamuzikironivaj.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/vunibidogedubif.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/kubowogutogodafagon.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16081d5bd4d0f1---jimofor.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/nenojavezisopinuxal.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1edabd9d3---nojonajebumuk.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/19783783969.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/pajedavowenuzuxumaf.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/66508459212.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/ridimofizoxivababuvivit.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/venusukesugot.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/af5ca5e496c86d0db2e35c2af2bede2f/dukotefes.pdfIn 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://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_off0000c248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC248 10936 bytes
SHA-256: 5105cbe1cfbeeaff3693177e7957018ebea31ff6b4136219dc71e17f60af8d0a
font_01_sfnt_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 17932 bytes
SHA-256: ca8fae4e41a05b88d07ee127fe5659bef59e8861e3245ee5d26c57901baecefb

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