Malicious PDF — malware analysis report

Static analysis result for SHA-256 98356d3e85ee5fe3…

MALICIOUS

PDF

77.6 KB Created: 2021-09-25 00:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 649450eac849138723554d70a208195e SHA-1: aa766e675093d049a9e9c3ef0715b2726e64ae03 SHA-256: 98356d3e85ee5fe32a47a0d2deaf9d2dae7deed321765d38225f96cee815810e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links for SEO manipulation or to obscure malicious destinations. The presence of multiple PDF files within the URLs suggests a campaign to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nirkongrp.com/ckfinder/userfiles/files/50011349594.pdf In PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/26962931718.pdfIn PDF document text
    • http://synhbio.com/upload/files/bisaralis.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/bororajuromiwupesufud.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/43632246693.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321507cbd7c---60732425673.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/50272364947.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/28c637e5950486f207f973353ca34e10/baruzatoxajiwudasijaw.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/34194030577.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/11288568967.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b8f4ff31---30175898384.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/jipanekudatelowarejo.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/40034998895.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/771b96d176026d0ba779c4d78ce5b3ce/luwefozivu.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/fipojuxowawaluvapivopibod.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/dept54sfagq9asotiv6tgncc73/35887975909.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/rejozixex.pdfIn PDF document text
    • http://praguetransfer.com/files/file/78584280573.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/sareliwowirosiv.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/zarutasus.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614161e13e1d6---55727377516.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/3598446008.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dec1ea2f37---siluj.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/pozogikezul.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/tobarazove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=minecraft+account+generator+2021PDF 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_off0000c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC677 10684 bytes
SHA-256: 8d881c80f93d480577906d6ac56b0c3d46fd981c2134fa89c728967bf6133603
font_01_sfnt_off0000df32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 19256 bytes
SHA-256: 6dcfb838110866bc1bcb83010a6088903519f4ced3db7398d361f4266f4a500e
font_02_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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