Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9f715f3434c8e7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 00:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d60a94613f5463c76a221795f3961a83 SHA-1: 5529bc909ca32ad425d98d382a68c29b5661f6e0 SHA-256: 1a9f715f3434c8e71e7e39c9784db3be2b2eea4ff9c40d5273d1f952afd45383
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 numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.tramag.pl/upload/file/10527695181.pdf In PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210902_AE718583F10FACA7.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef03f78336---39530448459.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21090802004480679158mx0.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210901104541.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/22299159446.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/3797205069.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3aa94444---fokufidadinejigosovasu.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/lusewilegokepanubaji.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bhp102vgn3l6mkdjj7pv3p89r4/27423099633.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/8830266774.pdfIn PDF document text
    • https://dom-titan.rs/files/62441312399.pdfIn PDF document text
    • https://termoformat.md/img/files/61133862195.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/nakopevana.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/zufosaxosiminepuvix.pdfIn PDF document text
    • https://2acontractor.it/images/file/lidapiwi.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/64059667233.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/747jensrmg69js6a5m4ovca5jd/dekitezujaguk.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/9867609667.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/sunukanoduzumuxaw.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/rexigimazu.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/tojitojago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=learn+html+css+and+javascript+pdfPDF 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_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 17548 bytes
SHA-256: 449b5e56c2ebc33cb884974eef8726030d4602588b80211c65f705fe464fd1e2
font_02_sfnt_off00011d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 10916 bytes
SHA-256: caabc40ed84c7ea42ddb6f3317ae571f422d99d1580ace34535dde9619189333