Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ac52183a4a6951…

MALICIOUS

PDF

73.1 KB Created: 2021-09-04 01:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 47f61a6d66591411af28cef7c861dee7 SHA-1: 514ec17e178b3177184608f346a374233536b176 SHA-256: b8ac52183a4a69515ba2412cb7d64caff36e06aaa23bf6430d8b5628566ca39d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to leverage search engine optimization on potentially malicious or compromised sites. No scripts were extracted, but the overall structure points to a link-farming attack.

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 https://irlanc.ru/uplcv?utm_term=introduction+to+computer+programming+with+python+pdf PDF link annotation
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/vitazedejoxidolo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gilosodikasig.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/rolibimajaladufoluvox.pdfIn PDF document text
    • http://henca.com/files/details/file/45225618524.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/97f89bfcb29478efdfd5b13b7134896a/2612350098.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/supepegexabesaname.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/noninitiwi.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/85519839796.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/32309403382.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/58034432607.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/91445294740.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/84741264436.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/xulefaxizivugokozami.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///davoxul.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/6686578267.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/78867932607.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ngc01aaudkcabcrop2ec0v813g/18720353109.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aaca292059d---woxurenivalozuna.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/numetosikas.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd31e938b---xipanavuxevepesubuk.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/15923697648.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/13562564359.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/ferililatonelobiwofuw.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/25273940823.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_off0000bacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACF 11104 bytes
SHA-256: cd7456e398851e4befadca237689937d9f441e61a0a8401ad9c14cd36a09a9ff
font_01_sfnt_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 16260 bytes
SHA-256: 4e5613ecba726dcc74b7450b7bba9b545f772f679abc7b6c0789249b90dc69e3
font_02_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.