Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80fc07cd18912cd…

MALICIOUS

PDF

91.3 KB Created: 2021-09-18 13:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa45ef9f859e5297f585d83cbccb7e01 SHA-1: 5f96c9f218d12b3226f930e39c23aac754aed6e9 SHA-256: a80fc07cd18912cd02457a376b741c9005fbf6c345aa97c19cc0c0a21b172a76
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to redirect users. The presence of these links suggests the PDF is intended to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=torrent+search+android PDF link annotation
    • http://bipaf.org/2009_home/upload/editor/file/68587852088.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/xafikofumuwadu.pdfIn PDF document text
    • http://onelove.cz/file/46127772156.pdfIn PDF document text
    • http://asid.rw/userfiles/file/21460491997.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/pojupatewok.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/64647788475.pdfIn PDF document text
    • http://healthywithhart.com/res/file/natasiguvobawogi.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/27065797612.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e20e591743---bezizujiropo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/fe42a890deceaf9fd0969682660c5917/23461479855.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1bb7d3ce---gaweditojujabe.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ced217ef9---89187438915.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149a088c48---9666784953.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ef74523d909cc4ed0df1de1fb168cdb6/zowatixikudepimogawibi.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/kaluludogoviju.pdfIn PDF document text
    • http://www.siposferenc.hu/html/jatebetorakubofubizusosu.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/dosexamokuzavisim.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/12834744021.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/44790233521.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/28610286905.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e460df02---xodafegaxewenozepimip.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb6c0ad404---98374874992.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/daginofeka.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_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 18844 bytes
SHA-256: dac10f91c97a1757986cded62c4ef39d148aa9d986defb9ce15adce8428a9b49
font_02_sfnt_off000148ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BA 10384 bytes
SHA-256: cd2b7c0068221954ec50749ee1ae7af883c3c12948b46bcc9d7c8cddc2c47ebc

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