Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa34cfabedd0696…

MALICIOUS

PDF

90.1 KB Created: 2021-08-13 07:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c5657352e8c7d723fcd32dbf1e8173b SHA-1: 81b65f78f2fc5baff5b125372a2f305efefd4fcc SHA-256: dfa34cfabedd0696d70eba5af6af399ce897fd78dad51acb01359ee62a177b42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://laborke.ru/uplcv?utm_term=avatar+hindi+dubbed+movie+download+480p+filmywap PDF link annotation
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/2f78vpl2rlvi1f91fik31muuu4/nawarelivamaluguf.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/8089349473.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e126dcd15---zemetozokeparuzabiletozi.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/08931e10cf2fcf4cb8f696ca424ad704/78499943584.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/82bd63d0035418257c36261b9e64be7a/wedapupawegumalobudur.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/21724776208.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/97d31d973028832abfa8e9dd9805a8cb/xibinutusawa.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd9798e5f9---96328815282.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/29366176678.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/nefekazagaboretugowumafes.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/92079574960.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/7424492274.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/zirevujivopapatebogowe.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/ledunufutaxam.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/1001351582.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3324a383---92144363045.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210701_928D06909381DE10.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1a0218769bc4784c09882736f796c315/53028937035.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5e9016d1af59951fae9f90bee6acbc8/vosuto.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/rezofupuzebibezenonedax.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/dunuwoxawotuluvixafosaw.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607448428dee7---3335363037.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_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 16884 bytes
SHA-256: d1d00d806c633b3364d046679b2e1e309451421b441720f724aac7ca52bb3768
font_02_sfnt_off00013e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5E 11492 bytes
SHA-256: f9e31d73725758958fad5d2962ed7a1f5829264d812fb0ac246d04a9cb269444

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