Malicious PDF — malware analysis report

Static analysis result for SHA-256 b334c8728f79b4d0…

MALICIOUS

PDF

70.0 KB Created: 2021-09-17 08:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acb62220f15305c88d798235978631a4 SHA-1: 2a04226e42e5fb1ac37d687b2fd155e4cad636b7 SHA-256: b334c8728f79b4d0b023efac74ab44b83eaff7f883362a93a2e6da1b51ec4977
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the use of 'utm_term' parameters in some links further support a campaign to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=12th+biology+book+pdf PDF link annotation
    • http://olech-rzeszow.pl/userfiles/file/58533557016.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091284327_674288257.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/wulenalawerolofagabo.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/rakijonebobivuraso.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/fobupifa.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qemett7bjpb1ciklakv7m5ids4/xebubodiwexu.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/bugomopatalov.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/3259d18896274b4e48e293f74b282ebb/vovelizakunitajogaxopeji.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161433081d59ea---xolokekeripaladafi.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/bosubuvitutakosuzarudum.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/41646735040.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161342464b6868---92310825869.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/zimukituvanovewa.pdfIn PDF document text
    • https://podimercrm.com/img/files/xabitabasapuvifekilozazof.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613a84cb6d070---buwemaguguvepozebijenu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161414921be56e---90461030823.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/lutegesi.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/58445236151.pdfIn PDF document text
    • http://pk.mo/userfiles/file/50557530739.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391adcdc662---rimun.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/tomoloduzubikade.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109050123098780.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/8444417662.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/lafaxijag.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_off0000b0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AA 16572 bytes
SHA-256: e16900639a9c3b89dab611677968f24f096a55c0e6569a64cc451b385874e25c
font_01_sfnt_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 10532 bytes
SHA-256: c21a3da19e77c6721b5d0292840c559d886bbe5ade99fc90ac3a966cdd054f6d
font_02_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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