Malicious PDF — malware analysis report

Static analysis result for SHA-256 9337ccfab2bb3f13…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 13:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 25843b90edbb5b7a9344b59da4ed1d83 SHA-1: f6d5ab7bb670471a180a91f8f524609e586aa17d SHA-256: 9337ccfab2bb3f137a1deb66cadfe2cc94da452732ad2a0d7d1a0a53fdfb430c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which appear to be part of link farms on disposable or compromised hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates attempts to leverage SEO and compromised websites for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=kinemaster+apk+download+for+pc+windows+10 PDF link annotation
    • http://wwpokebar.com/uploads/files/nusokaboxe.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/93295122217.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/66914895241.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/reserajiwukamagi.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/dotodikamevifozurikige.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/zafovidale.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/42558120095.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/kebevuposofopu.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/fizobajemipabobapikoxekek.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/maminododeb.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/39361205192.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/tunetunajixe.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/6523050358.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/96606986617.pdfIn PDF document text
    • http://vejwun.cz/images/32656609558.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146365c8fe9a---kavexorebu.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/64eff824da5636bc9429cf622255db12/51236282082.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/lewetobawaboxibitamo.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/xinibudodubavixabovaku.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/sotemokusewalimodubatudo.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/leziralavenerur.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fed61c24a6---fitowojag.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb711dc4f7---vogizalidiluvikezisoj.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/gosixedamuduvudo.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_off0000d4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 17324 bytes
SHA-256: 5b7ecd2f2a363b647063dbab02863022096cc029d58934a1d3981e583cd0d932
font_02_sfnt_off00011942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 11124 bytes
SHA-256: 95d54826aa5ca0080253965d331c39976deb9c8696970c8c4c7b5f85f36a4943

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