Malicious PDF — malware analysis report

Static analysis result for SHA-256 a098ee429a4af2cb…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 10:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0037e28e594107ad2f749bd5f1173ad7 SHA-1: 74ac7a2bfd05ee25eb5a43ca1a4af38cbba3e22b SHA-256: a098ee429a4af2cb85d69ccfa51215f634303bf1c4d27124ff95cd51f3b659d4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. Notably, the file includes an instruction to disable security software, a common tactic to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://ketchas.ru/uplcv?utm_term=pes+2013+ppsspp PDF link annotation
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614024dbe9aed---botokekomesosineropunos.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/b302a88dc74fd0f2285b33809469178e/sefotenejagexanidelab.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/bajotawaxabokarij.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/podopexufolob.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/92543821486.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/wukiroxakofala.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/90862029826.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/melexekipulofedila.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/99902ea27ea4aaa5d1a050cd4857c77c/20145118883.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/nixokovijija.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/58356394987.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/4275740266.pdfIn PDF document text
    • https://kawanmto.info/contents/files/pikelevek.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6394c839---20453933956.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/76276459275.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/94041456057.pdfIn PDF document text
    • http://josquin-capella.de/download/nebekav.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/60201727855.pdfIn PDF document text
    • http://devison-matras.com/upload/file/vidofetuwep.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/tavosajumenonilugatorilip.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/67096801773.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_off0000ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 17916 bytes
SHA-256: b7086ce57e59c2544bd41f967b969bb0f1f4964a8fa249c63c0b9052b2363b87
font_01_sfnt_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 9992 bytes
SHA-256: ede2b299d695e7d3325720e4f9791a27bbc3a11c5fbc45dea21e0e7dee0f0587
font_02_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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