Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e68edcb14e6eeed…

MALICIOUS

PDF

89.3 KB Created: 2021-08-06 11:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5cae775841c4b074943ae55644230e7a SHA-1: 97011193313682b602ff086a1a7350f1d62e2974 SHA-256: 5e68edcb14e6eeedf5b4c24fd7e81e826eb60701befe8d84fe59a966731890cd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and link farm behavior are consistent with attempts to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089bd1a3970c---96020805428.pdf In PDF document text
    • http://afgventuregroup.com/cfiles/file/riligosonotiteno.pdfIn PDF document text
    • http://arslanemlak.com/E/file/73927398296.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/57972908597.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/h9ur25vgr943pc3cks5p61o02u/vozigodazawilan.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/noputuzesofopibekeze.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/4853984613.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/30158922903.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfb351bf40---pomosoximanaxepezijifab.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/43447849636.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/80710521489.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/wemosedotisakig.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/witinizu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c747f30b7bc---filibaki.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b48f9319c4b---81937949497.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/tesuxofipanarumategijedar.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/numekurakadunaja.pdfIn PDF document text
    • http://ledson.ru/upload_picture/7221592053.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fad8852bf1c---57499196069.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/45532332765.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b544652207e---kopofubanafawu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d32a725b864---98501366506.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8d9e965792f09ee55cb202fab99a115c/rumirugoxuxaxobitujeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=grade+six+math+textbook+pdfPDF 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_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 16664 bytes
SHA-256: 589de463f6d0226d6f7c14de179def9200d499a9a7d22a0c296372be13b3d1ac
font_01_sfnt_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE1 10988 bytes
SHA-256: f4437f864678335a88db01b9045a710d4374676f68485cdfc2b45142c2a6f26a

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