Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a78d99c53a142ee…

MALICIOUS

PDF

87.2 KB Created: 2021-06-25 20:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 657cb082c1d9f0a0769eccf6c089f8fd SHA-1: 33c46540843b01a3a547288d1b525098999ca12e SHA-256: 2a78d99c53a142eee7416a40f7897ff26b87ca663d3b3880d472c34c631bf395
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of external URIs and link farms suggests an attempt to lure users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.x454.com/wp-content/plugins/super-forms/uploads/php/files/2oo67f9us4cs1nr50m7smdatc4/paxusutip.pdf In PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/dcd31f96a14c4af0c24971e1fe09c169/bizuluwaromarepesubisapo.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/xajikuvuvoxagewu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/54ca46e3fa0e241bb3349077778b9bbc/mawamil.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/bitul.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/tubuzefakoxofeb.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/55598097791.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6a28c5fa---22570761439.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/46663591661.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/53740517485.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa42f891763---xudapujifejupomofo.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/lulofuxukiperefe.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/gojajo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3fbccf0a1---litivez.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b072dc3cccd---mekidakusagaxenidixevir.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160987ae4604b6---77949283635.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/zovowopugoduwumeposuneg.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/b27tso6eh7183b7us8pr7tuet0/tuwuko.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6300ee108d294e2ddfaa586a54e41e7e/25237699865.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaaed23342---23111732843.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb3b6ce5d9---sivagefifa.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/fejifupukoxaberelu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0231b8466---fazewizuwes.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/93918465702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=did+i+conceivePDF 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_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 9856 bytes
SHA-256: 4b9ca29acc055160d2f6ee5d8001b6058bdae9dc563cc1ef70f571d031cf7055
font_02_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 22016 bytes
SHA-256: 86058f0ff0e6d98f604729aa220ed921d02a282c200a03eab58ae51f53bcf67e