Malicious PDF — malware analysis report

Static analysis result for SHA-256 242abeb81ce8606a…

MALICIOUS

PDF

82.1 KB Created: 2021-08-29 07:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1c19d7986748065bf3ae1d46c3e2403 SHA-1: 6b7d2ddcb756371eb68ff82a20af689db726e6b8 SHA-256: 242abeb81ce8606a61ec0ac51e10cf5e7e5370719c7101ce66a33546d4f93650
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable domains or compromised CMS uploads, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest the PDF is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://mldom.xyz/web/img/podborky/files/majetivibogagaxejabo.pdf
    • http://avrig35.ro/uploads/fck_editor/file/tiwunufigoxadigosa.pdf
    • https://gachbinhduong.com/upload/file/7687929286.pdf
    • http://be-now.pl/userfiles/file/27281819172.pdf
    • http://leaders-adv.net/userfiles/file/55471987455.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859f84b9dc9---95473964917.pdf
    • http://bluefield1966.com/clients/26642/File/depejidawunak.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b13e7e60---66359012233.pdf
    • https://computerzone.pk/file/3947229453.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d865f79c29---16756245541.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075fbe7e16a5---gaxikulugepewuv.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/5k8mb8310et1o7t81h9cd02hr1/pezebaxagov.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f496fcc55c22fa7bbd3c2a5457c54b17/lamokefoxulepaj.pdf
    • http://wxhsbl.com/ckfinder/userfiles/files/20210728_183830.pdf
    • http://www.mostenpo.jp/userfiles/files/komulejomakelorubufini.pdf
    • http://sns.hu/_user/file/nixumibikasufi.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610be3eeae035---56244308414.pdf
    • http://computergramm.com/userfiles/file/lakiramefurivuxozapominan.pdf
    • http://mcleod-bobbitt.com/clients/64742/File/suxanuwogagid.pdf
    • http://millecolori.it/images/file/ladorimeboxuvaposiwotu.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef3ed3fe9b---80793037603.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/33f4517ded325d219726574822ee3525/50187513023.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c2da7c573---xefubese.pdf
    • http://jngf.cn/files/file/2211233724.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+strength+training+anatomy+workout+2+pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8aed070537afc43dd4e4261c39c091cd/48711397770.pdf
    • 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_off0000d809.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 16792 bytes
font_01_sfnt_off0000f01b.bin
f511e15d87755db5c4080366d0fc5d11e42a5927c67aef31071e7cdb40952397
pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 18024 bytes
font_02_sfnt_off00011f52.bin
413ab5ff6afbd7c16f69117af018e6256f148e55800796d7b1be078269803903
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 11376 bytes