Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf49b55fdaf6fbad…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 10:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4321d4f69af1980e2378c02b52435342 SHA-1: b744cb1cd7bc2a7defa5aca89ee47f3574aae900 SHA-256: bf49b55fdaf6fbad365ce82e1b2df5bd5bfc6f6ba6d6cb5ab5462e353d060924
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple disposable hosting domains, with one URL explicitly mentioning 'gta 4 apk pc download'. This suggests a phishing or scam attempt to trick users into downloading potentially unwanted or malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=gta+4+apk+pc+download PDF link annotation
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/worasolonaduj.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e424ba2ad8d7061b19ac9e278546ecba/73479736712.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/93599774931.pdfIn PDF document text
    • http://ruresept.ru/files/file/96809235134.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161328362135c2---fokerelurifofa.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/96056972023.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/dorog.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/32745363276.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210916084654.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nafaxokuso.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210916102541_7ropyd.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/xutizisununavedij.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/35358998532.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/67031236802.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/2773202002.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/midewalijowesilinit.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/nenoxabujeruregosetasew.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434dbcda02c---kabagulukoduguzewafa.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/97681830272.pdfIn PDF document text
    • http://reopen911.info/media/file/nudofiwodixirupibu.pdfIn PDF document text
    • https://badoza.net/userfiles/file/kexekixofapemowewuposetif.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8u0gl22mt4aosrucej2bjie1h4/dowuronotugufu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5017f2c2---vafebuv.pdfIn PDF document text
    • http://4yoga.by/pics/files/79377846905.pdfIn PDF document text
    • https://festacontinua.it/public/file/wipav.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_off0000bad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD5 16488 bytes
SHA-256: 9ec5bc0219fe8eddf1ac2a24107f6cd8548300a36d6e9769e73999b3a77b2f46
font_01_sfnt_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 10312 bytes
SHA-256: a71f82bf37596ba611c1f18fc36e50d7e93fa1746cf841fca8fbe5331dbed06b
font_02_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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