Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9857dcd4cdf8e1…

MALICIOUS

PDF

86.9 KB Created: 2021-08-17 16:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: cb3076ce137c4a480945531a534d844f SHA-1: 4111cbed75486f0fe4367d33af3f3f8d10bfb4d4 SHA-256: ba9857dcd4cdf8e121da86a36811e3096975c2bb36eb51ad342ede003ba9cc34
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, hosting numerous URLs that point to other PDF files, many of which are hosted on compromised WordPress sites. The primary purpose appears to be redirecting users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940281a7e3f---rusixot.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909c72a6ea3---xadipatapa.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/99350393637.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/53861375349.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/25d96fa9b7e1628d63e3e9423e2f7f83/rukivoweruwekevemu.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/30434803173.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dgtpeuhjc8g1a5cj987ilrt8g0/37350475757.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59c2e9a48---safavakulerujenijarunazas.pdfIn PDF document text
    • https://duel.pl/userfiles/file/83563571963.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0bdfa12c6---posumavafivujitejasaz.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6acb3e32cc---winenedukutoramoxi.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ca536f85---sijudewinubiko.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/duzepuromilatas.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/56143354610.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/puwodowuni.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fobajuvafidafagizinepile.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/towepirixuwofepefi.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/4044294535.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5b6tin7ovqgi4stgjeimk8jt55/fosabufoperer.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/29986245555.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/89740506842.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/17039785333.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c38547934---xozukurumekozuw.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/24ce13d478f8392359c0b15da0c1a15c/mivekekabipebarewiwafib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bendy+and+the+ink+machine+2d+jugar+gratisPDF 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_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 17808 bytes
SHA-256: b08250128420ca721e73c04a5c0bfd1bbccec31aa41582ca21a139689dc0c21a
font_01_sfnt_off0001198e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198E 11260 bytes
SHA-256: 011b3097ed55534504c745f664abd50d4f34901754bbadd480275fc4f54259fa
font_02_sfnt_off000133a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1