Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f3985cbb345a9b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 16:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d2dac7cb79572c7066816814e11dc90 SHA-1: 9c96f4d0855d9a45cf658f37488d7c74a820990e SHA-256: 34f3985cbb345a9b58bb4886530661ac0bf900375be48410a74f793a7860b1c3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable, suggesting an attempt to lure users to malicious sites. The presence of external URIs and link farms indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ldbell1965.net/clients/85689/File/fupatitipakonuw.pdf
    • http://englishplanet.info/ckfinder/userfiles/files/wulifudipivudotolagop.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/73ff437cee77b1c145157f884aad51a3/nagedofuwiwosadiz.pdf
    • http://hrt-foto.hu/_user/file/visekosufisijozotit.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a212a5104b2---99570668255.pdf
    • http://textstricker.de/benutzerdateien/61988200409.pdf
    • http://technoculture.cz/admin/upload/file/vuxokutul.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/84c1f808f29c964007a9d3b922938ee4/91079308988.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5eee9cc704---pekeso.pdf
    • http://hindel-relax.ch/ckfinder/userfiles/files/nosipudivasewubujafomeg.pdf
    • https://vongtaytramhuong.vn/upload/files/mugini.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/bf873eb3a3d1d1225e7bd0e589e9a7aa/tijikur.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160807d26e7e3a---62192016612.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b636738c5d9---gukiwogedosujogixor.pdf
    • https://atamergranit.com/userfiles/file/dutaju.pdf
    • http://apex-architect.ru/images/file/52351470062.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/24833733602.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/kumogevovaxupesidoref.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/784d56d0b1f5983bdb1702714ce0289e/xubirud.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607329f212369---xapozibikejikaboba.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb55275b47---50835472629.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0eccb16a8---41224089734.pdf
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/zixeninulitufofike.pdf
    • http://etre-belle.su/images/file/92286875887.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcf2928bc---vivowaj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=square+root+of+98+in+radical+form
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3ec.bin
e08e7259ac40352369a2114d3351e09ed33fa4406848c3fd8d817a9b7b591a02
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EC 11164 bytes
font_01_sfnt_off0000ddcc.bin
012daa049d53de9b4c24cffb152d0555c22fa4f5f8a5dbbe9323db17b1d408e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 15644 bytes
font_02_sfnt_off000104e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 16792 bytes