Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a63cc408ab73fe…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 07:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3932384d3bb3356cac992e812d6143c4 SHA-1: 7280c2b9ce881f536641b7c9d27e6a7cdf2b3c88 SHA-256: 46a63cc408ab73fe57b3a7abb0607bd46a8c88dd7a2293826051e19aef5e922e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through the linked sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=masjid+kristal+pdf PDF link annotation
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/63177989409.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/vosuduwibegigirejexex.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/doxujemukemeserotib.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de06b917863---lukijafijiwoxitinojixero.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9cf28eb65---lisavujexeveraxus.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986cefe097b---sozobumemadibojajerawosik.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/aa9ad096d5d700b91d714d106bf34ffe/porebusuni.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/winesomugusexolujuko.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/93816669895.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/44518144896.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/domebotusipafoku.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/patewo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f51568e5ef---jafonomivusitinosesosezar.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/90093399162.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc5b043c7c---juwaxu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b9512b8db---37973310740.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/lagovedivamutirofofuj.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/tekelurifosevafijos.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3aa21a75ac7c958ec7c0c648ffebdac1/7770800339.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/zarejofukatewugepazakel.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e5dbec56e---soselobuvefisiligarima.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087af924d339---48151179437.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/74568050915.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/10677457890.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_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 19772 bytes
SHA-256: e4bac249bad1662d6fee29a713e87c29050717583b7bb11ad08b14436a253894
font_01_sfnt_off000118e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 10352 bytes
SHA-256: 36445ea1a1c1f5025e0e788d1488f88460c09bf1bb94c4a27cddd98587f518ec
font_02_sfnt_off00013052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1