Malicious PDF — malware analysis report

Static analysis result for SHA-256 deabce5f89d2de4a…

MALICIOUS

PDF

72.8 KB Created: 2021-09-06 05:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d8cb31d0dfffb4d4fb6dba5326c755ff SHA-1: dd65ede6fb5fc56138438bfd5d0fbbc679694565 SHA-256: deabce5f89d2de4a7f96848a12e19f05f68043bfab3258bbc81a36198cbdc150
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, likely to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://ketchas.ru/uplcv?utm_term=converter+pdf+a+word+nitro+gratis PDF link annotation
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/744bojmumnk3f897ot3q0na906/32746805153.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/57285707272.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/rnld98pppcrfapq2r3lrj2e6dc/17589436130.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/87500120444.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a721ed5dfd0---kejimepemalepi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5ec9ed54e---4053696443.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/78092925508.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cdec9b46b---40749965936.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/40124523707.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/zodow.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/75267499130.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/vinipikolomabetowupoj.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/45819983031.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e36a2668c---nikutul.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/4k113q9d4jpnth6tf3nhqg3qr4/xegemumor.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/nivozibitokirax.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aecde1e9231---jufoxisokitadizarojexiz.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/xaludareziginewosixefelos.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089bee325a55---72739577157.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161219a2b417c6---22314083572.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0852446ab9---82147670758.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b65352ce4---15410728328.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/somowalivumevi.pdfIn PDF document text
    • http://anctools.com/ckfinder/userfiles/files/lidepilibufuxikevini.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/merasidalawibonobazem.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/12585290046.pdfIn PDF document text
    • 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_off0000bcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCA 15496 bytes
SHA-256: c7d3b0e15da8936e3a5303e72680a9809ed5006fca989205c6fae5070c5f4b8b
font_01_sfnt_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 10808 bytes
SHA-256: e75e07a60ad20d34c480f643aee66a6f99a1a9dabbe9c7ebcd0ae84411f960f8
font_02_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1