Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac33a27fe77c26d…

MALICIOUS

PDF

67.3 KB Created: 2021-09-25 19:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d0d386b0575d95205316bd340e5b5e7 SHA-1: aa828b31e3adcc66c4f382d89fb1820d250d9850 SHA-256: 7ac33a27fe77c26db1241836fef123642d4d7c5bb9ac983e5c0385f2e0acb318
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to trick users into clicking a link. Multiple heuristics indicate it's part of a link farm hosted on compromised CMS uploads and disposable domains. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=nba+2k20+free+android', likely lead to malicious content or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inwebjor.ru/uplcv?utm_term=nba+2k20+free+android PDF link annotation
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/93f492260e101431d460adab2abc9586/sosesamabemake.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109171351593534.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/51399303538.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/sufitavevitedisiwigexadi.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/35871066823.pdfIn PDF document text
    • http://turatabor.hu/media/95405438512.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/38ba497c67955102ad259cfa9df263d9/42345382723.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vavetejugejesokudox.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/64377477426.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136202d97560---wisuzerufawanapel.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/43429846205.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/47273864138.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/litep.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/welumopomedomo.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/54153820052.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/fesopusipaxugiwuxu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141563e687e2---43072712548.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/23000782169.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/82379014835.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/gubufidabufulenigoxew.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/tinitisabupumol.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/39508152211.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_off0000ad37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD37 10484 bytes
SHA-256: 0d82e390b1b7e85d50801aaf39bb2834a06616cee90c2447ca4a5574fe5dfddc
font_01_sfnt_off0000c52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52F 14088 bytes
SHA-256: 359623dee40d8dae2cf0bb06e51b5c146244340c2ba54c73330f4113a54665fd
font_02_sfnt_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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