Malicious PDF — malware analysis report

Static analysis result for SHA-256 df43cc1bd10198c2…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 18:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e6ba33a9472f11e0275cd72fa4b1babe SHA-1: 5730c50007c1653e6bad5d1ef5b64b73642cbba2 SHA-256: df43cc1bd10198c282d2e5d17993ee1be1263417505411ceefcc404d4601ae6c
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=sbi+debit+card+apply+form+pdf PDF link annotation
    • http://bajcsidavidfoto.com/_user/file/55028771060.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ht57nsfkj65rvle2iobb0sh7ih/jirosow.pdfIn PDF document text
    • http://cjatkinson.com/userimages/siripevanofokodimefu.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/971f83ef844a233daff304397ab4d1ed/27297877905.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/pagutakirapexaguxija.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161330e0ce76d5---33967322082.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085f7ad847be---napufuvemudarog.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7185d0a5521709005955bb07cdb88014/76910030838.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/35296686310.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/rupovibuvoroj.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210817132438.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/44446638869.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/xiralufikunebevumopam.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/wigibituxanonumajamafu.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4101b3f947e06f8af0aa65a403391b28/guvemorejetifusirixuvu.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/wulipezabimevojekugutepak.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609955d99e417---40367371662.pdfIn PDF document text
    • http://babamoleskine.com/files/file/nelosusisuwopujadi.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16123a18457f83---35417671845.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/2234475762.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/luxare.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/6f630d90796785f0e566b373a01b884e/dupiw.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/27461452656.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072781610cda---24007253120.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/63871650997.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_off0000d27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 10836 bytes
SHA-256: 49b3d1c9beb098dc9834be8470f85950e066c730f85b6f883e598fae7a90a87f
font_01_sfnt_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 16996 bytes
SHA-256: b0cb37e20e119e664bd63f946db90afca999457c2124de537ec855ebf198f8d6
font_02_sfnt_off00011731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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