Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6ed6e16f40066f…

MALICIOUS

PDF

84.9 KB Created: 2021-07-16 14:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: ecb0eacd1260992d264329fd468b5caa SHA-1: 6376eb20e6e06e327fb68d52bf6deeb04d8c7500 SHA-256: ff6ed6e16f40066f8a0d7c5c586b162985183870689a06786cecdfb9db2b60dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.fashiongale.ro/userfiles/files/bejitotolesolak.pdf In PDF document text
    • http://a9188.com/upload_files/art_files/files/20210710_051014.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/nenuwolusezagukiterufu.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/moxub.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/31998185809.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608847c93ae52---88547609860.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/tirazadijujukogu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/26002103305.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/15194053372.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/26645775097.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/gojukuguletonobuxise.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d404b4fe66c90f56477f83a8ade33f95/lefuvida.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/27571449194.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a991545d4---97606871328.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/616ee92e75f32fd6e75ea272c1982eec/fuvevalefi.pdfIn PDF document text
    • http://recrute.fr/files/files/90422831563.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/8j0eh5bp6ic595k1hgiggij3mo/22162720729.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/697c3f62abeb61b96e926f9ea30a60b0/kupufuxosininixebufuka.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/podipemepejup.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ts8aomcqusa9l4pph6ct6d124b/jusobibapezojov.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e821307c---99472437414.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/xazesubefufomaridimomej.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/53f805de2525cdfbaea0c92ce16fb681/pisokobedopagikej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+many+cups+in+7+quartsPDF 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_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 10844 bytes
SHA-256: 521779c1b054a0c3518452aba218356ac7114e2cde8e8166a66ac7f8408376b2
font_01_sfnt_off000103b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 16572 bytes
SHA-256: b3c083a7798ebd3ff3445fb3c5e65e8a8b6c70b5b541df4b14dba9a46fe3eb48
font_02_sfnt_off00012eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1