Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac9184029f08a4a…

MALICIOUS

PDF

83.3 KB Created: 2021-10-04 12:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6e0d4be571408bb2811917839da232a8 SHA-1: 4d1400a94b33dc4f8d1b50c05d8452d7f6342966 SHA-256: fac9184029f08a4adab28c3188077cb10aabfd59ea8831b759443ea79a897714
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, several of which are identified as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic findings suggest the primary purpose is to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ageddfjtjgrade.pretty-match.com/upload/files/xunawadokusisidu.pdf In PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/sekimubesawudi.pdfIn PDF document text
    • https://x-software.cz/data/file/65346937408.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/25269488750.pdfIn PDF document text
    • https://chothuexeninhbinh.net/data/dulieu/files/kibisumovovukakobasax.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/67268628192.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kotareruzomuxijatopolos.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/lenijekaselonudoweg.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/86910432306.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e374121224---45911748712.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/7166427781.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/73672773512.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/saxogodiwel.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/78610228859.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/96289818485.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/bubarubefa.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/vitige.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/nakufesixununakaza.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/9f25c8df5cbbfba09f248899716146de/guxolebezudesijegovakodu.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/15386321219.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/92344500259.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16135e43fe4228---migukuvumuta.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/perujidax.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e4ad5d9f9---26310801596.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/fesobutoxunebigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=coarse+grained+meaningPDF 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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 10476 bytes
SHA-256: 722116bdf010b50782ac917b65e87f626c95dfab9266251aacdc15ac6dd7c162
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 21108 bytes
SHA-256: 215ce119bf0776fbd52ea1ace9d75c06da72bd98d98f58630f25a2382faf2f5e

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