Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4b183be8fddc06…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 11:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d07f7391501a9608810194f371c37b86 SHA-1: 3027a920e4b2262a3f022f0a53772fbcc87dd24f SHA-256: 0b4b183be8fddc062340008af5bd2c578158593e48109341418fcad1c6bbed9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what is inferred from the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=bien+dire+initial+pdf PDF link annotation
    • https://alansglobalservices.com/ckfinder/userfiles/files/81462022955.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816425c7c98---79626401575.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/xafowizes.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/95307021284.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/egi6gleianchv8orhbj4getdl5/pebokakinurimosovuxu.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/3308652658.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/zajudebabodogazanafed.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/nonariwi.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/webasedapidelemukoleg.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/kopabo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb06a21902---rafigososebeli.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/4u8ep8dof225r6658n7s89p9ti/radakerolazizovud.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/5441371377.pdfIn PDF document text
    • http://accronline.com/userfiles/file/juroled.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/qa2akl2a6h9aj1bk17651l9u64/nitubozawamibutup.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcb2453f55.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7eur489943p9bnvo8qdd05vq84/fowowuzewojevukeze.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc7b0e842f---wemolomoweredaz.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/83941299482.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/petagedelenakokuxowaned.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/15q8nft0hnpgof9giqlg81r1g0/39550666642.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/jalutetuxemasol.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xezeruzifezopuwemikumuloj.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_off0000d00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 10256 bytes
SHA-256: bc8814223993076871c4ed8d36f95f6b6c884bdfddc97480d047479f9c2aadc2
font_01_sfnt_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 19548 bytes
SHA-256: 2a4a941c66c3644826de84b6e44d3b9ef1dfb29a78c1bdefd71c85067978c1c3

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