Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaba188694062a69…

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 07:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 908eed787e88ee875b2d746a727a8f89 SHA-1: a9578678bcd5c5902b09bdec0548bbcac2bfc113 SHA-256: aaba188694062a69a6597f796fe25d8de7d97a3cdbaba2fca67a762ebb935e51
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting it's designed to lure users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts for a small number of links, a common tactic for evading detection and distributing phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://bosgo.mn/uploads/files/76765420291.pdf In PDF document text
    • https://parkettworld.com/upload/files/11591902120.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/60762958638.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad0cf68e86---47486089939.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/xazudageroxisun.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e98060d26acef3a127c5a9f34e7e4fb6/99966251758.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/47952184113.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/wesuvetazuram.pdfIn PDF document text
    • https://sainaudit.mn/File/94878144434.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/49385c7ede74dc5f76271bd7c1f7fc7d/lewulafuj.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/banevipujabuj.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/67536588564.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/84929460152.pdfIn PDF document text
    • http://saowaneecamp.com/UserFiles/file/mawojadedudomajabar.pdfIn PDF document text
    • https://equimat-cheval.fr/file/rusexepamimozademapoze.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/4224386062.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1a1aa3180---tizukowibipaxegoxa.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/29328540868.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/fowapafinezozabaki.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/87706011840.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/kiduninazagapaguze.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109050229067227.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/podalilesuxadedulopuze.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/zitogapiridavibabevonilon.pdfIn PDF document text
    • http://www.autodesguacecoin.com/ckfinder/userfiles/files/93341012126.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/22837982296.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/vivejijazakudagezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dav+to+mp4+androidPDF 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_off0000b61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 10352 bytes
SHA-256: 800307e1fb96ebcc1ee7132e4f37433cf541d401ae327160efb2ce6953951f14
font_02_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 18580 bytes
SHA-256: 46308f04f86883b15b0eb37a4aa65d2ec17d6078149819174fba31e09d171f36

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