Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38126e79324cab1…

MALICIOUS

PDF

83.9 KB Created: 2021-09-08 12:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4efc96f7d90539a0733a61d2c52739e4 SHA-1: 8bc1269305b441d1cc62d5b62ced7aa2654bc5fd SHA-256: a38126e79324cab13165bd12f2e2498733b3d7ef89360c40547888201a99eae9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous external URLs, many hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://maviet.vn/upload/files/melenifiruzobipabij.pdf In PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/kotaragilepikekov.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f418e041fd---97409421607.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/warikupatuviloxitizufeja.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bkqm5aok7qieceruik2gl66g9s/wipop.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/48340062936.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/65360298989.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/22337173685.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302cc479871---24010071459.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/xenokilizixoxolerexisaj.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/gupukulilojazazuj.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/30576018293.pdfIn PDF document text
    • http://cbstav.cz/file/60064413947.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/72499323740.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/95905736430.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/bojemimiwefoja.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/texejixiravajako.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/62381136986.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/22333c936b988e8ef524cb3f2d0a4cd1/24235961414.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5901df03000473ed37530f45e4fb0157/94058229653.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/finokuputosetizoj.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/xirepimejixinaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mothercare+orb+pram+manualPDF link annotation
    • 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_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 18108 bytes
SHA-256: 47e8d387a7f624517676b9238d0188b34688609c36d7448b20e2d16087233668
font_01_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD5 10612 bytes
SHA-256: 550005bb4f9ae48df7340dce9514c314e99b89b27da2b40b7cbe0661af5a0e29

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