Malicious PDF — malware analysis report

Static analysis result for SHA-256 604b350080db4a9f…

MALICIOUS

PDF

90.1 KB Created: 2021-06-29 19:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d0e7ad9961867bb5320aa99db6705ab9 SHA-1: 9c4712e9683671ddffc01366766ba612e74c18b3 SHA-256: 604b350080db4a9f97bcf01ea7a503a6638cdd81e1c67a8e6f65f2e4fa7c4393
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lure users to malicious content. The document body is unreadable, but the heuristics indicate a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b1fda5dd01504d074cf06deac7dde995/kitosi.pdf In PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/360ec63dcfad3ff5853b79fef584ad3b/85687689064.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l7iieqg132u61t8q98s87aofb2/36444112325.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/rumevozezuvisupu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qt5kh9cbnq7mkr5df4n2vk8cb1/41161574411.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/xorujaji.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608651e29b513---guzopokabonu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/65730ecadb6a65972a18bd3343cee1ab/67724374564.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f1f038afb---varemelotosegavokogipipo.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20eca5d08---murererif.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ca12e126b---17676366113.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858aa07678a---61734362922.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15a6d1418---kotasejazuwowenalitefajuv.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf5ec2907---52455127502.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/70048406644.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/687b6743356cfecb3648be5b50dd1a07/pelamemanebegixupaxuge.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160869fb648fdf---67003362560.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/jabazogagunijepukatiku.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/nhr9qn12h2go92gt5fnjii8tdh/69857603769.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/41c6dd82b6d556e82f3d2439c1eb087c/nopevowuxewuwaje.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/vatisojudizopa.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7350c105dfc6393ab7dde2e89688289d/81429974270.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/16895563090.pdfIn PDF document text
    • http://vce34.ru/attachments/file/fonamurafikufuzeroteroj.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/886b8c2c6bfeb64b05ed890fd0cb6f31/midadikofasaxek.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b1b20d33396f7332f607da7fbdf00b4a/43983973440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+places+in+dominican+republicPDF 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_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 10968 bytes
SHA-256: 5d824c7d1b17be1ec238c50e78081d6a9cc6d1a9de51692641af5e9d9afb0144
font_01_sfnt_off0001148d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 18252 bytes
SHA-256: c92d34d4d10fd30bdfbcd52e4d37e88986fc336023f9cc31224861481e2400bc
font_02_sfnt_off000142de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1