Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb2aa28f660c3a5…

MALICIOUS

PDF

67.6 KB Created: 2021-09-19 14:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: df03a00863756df7b555fba79eae215b SHA-1: 4c3146ae520d7293d650cecf74367c280da05b78 SHA-256: 3eb2aa28f660c3a50cccba5cb3706a4fb654e34b5fa81287eeeb19a9ba529d6d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure due to its image-heavy nature and embedded external links. The heuristics indicate it functions as a link farm, directing users to various compromised WordPress uploads and disposable hosting sites, likely to download further malicious content or redirect to phishing pages. No scripts were extracted, but the presence of numerous external URLs suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=echo+112+android PDF link annotation
    • http://shopsuathientu.com/uploads/userfiles/file/50876006859.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/xobazikedefoniginatato.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/fevedumivodubumatanasiwip.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091605355070554.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/gijenavejadifi.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/vewuva.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/fasulalowikamelisapole.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/85c45ecbc81240d35c65278afae9c535/32144134678.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/82611148256.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4f325824---muvubujasadepifodutuje.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/62648590060.pdfIn PDF document text
    • http://dongphat.net/upload/files/zogofumafideliwuk.pdfIn PDF document text
    • http://synphabase.ch/upload/file/gowefojifefesosutaju.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/gowes.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/wedewitosuwepifawemudawu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2qbssa605c55plb1e4tk15her2/23810449729.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/65146146723.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/desobojeborudad.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/lusoropelujalupiva.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/11465889674.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/kexurinibulikogiralekeluz.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/jitanulipimovadizejarer.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/11383448804.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_off0000b034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB034 13576 bytes
SHA-256: 5780cb5fe06e88a9e1ecf045d116b2827d5688b9bcb69fbbb3345e90fa60e3bf
font_01_sfnt_off0000d15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 10176 bytes
SHA-256: 0cb2956f36cfd85c414946d70487f37031193e96fafd0d48fcc2bb31c49bfbad
font_02_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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