Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b5e46f9fd2fcda…

MALICIOUS

PDF

88.0 KB Created: 2021-09-02 21:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae5d2acec8dc1784dd35e19c99de5028 SHA-1: 837127b726e180364c94ba9bda392749c40c9299 SHA-256: c9b5e46f9fd2fcdad1b156892a0c3aa1a9dcdfa1bc304c4faaf0aefac44a5a71
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, likely due to its deceptive nature and potential to lead to phishing or malware. No scripts were extracted, but the structure and URL analysis strongly suggest a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://gpe-el.pro/ckfinder/userfiles/files/melirupe.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/48b3e0acdb17933677fde2efd21580b1/zuzevolumakovot.pdf
    • http://jjmcp.jp/userfiles/Image/file/27287040438.pdf
    • http://hnkingdee.cn/Files/file/20217210852.pdf
    • http://iqlacpro.vn/emotive/upload/files/betipopekizikareli.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/2d10f0a241856e21359705ae19d7acaa/13095500348.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9fe78c633---42095283737.pdf
    • https://m-astar.com/UserFiles/files/74083789552.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe8a1170e---mekap.pdf
    • http://dekoblickfang.de/userfiles/file/44277385463.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/iigivehke16vqcpgg1047gpdq2/titere.pdf
    • http://zamel2.pl/userfiles/file/wofulijabelevo.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/hdekidupendonmhs7bafu9vbi3/2874714420.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/26077ec7258429ecafccea906d0ef038/lirukevedagatakon.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a07e022b7a---89279495708.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087185890ce2---lawaza.pdf
    • http://mikailang.net/userfiles/file/20210624130153_2072072499.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a79d66ddb---21549776716.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611ade6347629---zazoparovutipitixinamexa.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e75be476---fasamufupukilaviluz.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da24b5d5fce---mebosiwuxilosumabelig.pdf
    • https://egyiksem.hu/uploads/file/8831336734.pdf
    • http://thaoduocvn.com/userfiles/image/file/pepugumerab.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608728e44bca8---kitedumeguwawebozibe.pdf
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/27348486096.pdf
    • http://meadescafe.com/userfiles/file/josogebibolag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=manual+hp+pavilion+15+notebook+pc
    • 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_off0000f0e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 16792 bytes
font_01_sfnt_off000108f2.bin
d98b5b1f93325b6ba317d06e47c6e062c876854eb3a23de3412610736a1a33bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 18700 bytes
font_02_sfnt_off00013937.bin
bbed72338be6e16677a6d7dd0a636ed8f27c5984dfb96eda28eb39e2378d3522
pdf-font-stream PDF embedded font (sfnt) at offset 0x13937 10780 bytes