Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3b2a949aca72d4…

MALICIOUS

PDF

84.2 KB Created: 2021-08-03 14:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 613bfb4b4e264e18622a790979963cf7 SHA-1: 5eca8f875be114d1e556098ef2e906d066292fe6 SHA-256: af3b2a949aca72d4bc4684d59a27812248f7c6cc698bc0ad43e4bf4625d24797
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially malicious PDF files hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.toptehnik.si/images/gevuga.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9eebcb190---32154046314.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/jonmsv51pcto8p1430vacu01i3/3554437715.pdf
    • http://jar-ted.pl/file/ligenazuxivegulokumelib.pdf
    • https://onwater.my/uploads/file/95890726491.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/duvesamemonarifo.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/da7405f13ea6ec661a63c7809d215c56/46683829298.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/vd0l4a8uk8q68j5tqnu2uos58n/48705967111.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4412bdff---lonajonefevejiduwitel.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fcbf43762190844abcf36fec0d5eda50/99830290264.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994e1684131---vetepu.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/19363175794.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/55c58b01ebdbeda43bbbd788d502c6b9/31850771010.pdf
    • https://stehovani-ostrava.cz/static_pages_files/file/20683494187.pdf
    • http://crosswaysrecruitment.com/userfiles/file/43720677227.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/un03qvhc17h2t7s87hpm9kmtj6/lepadorefe.pdf
    • http://sanders-scottfamily.com/clients/26926/File/gibinuwiwuf.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3ef667a8e---ririgigito.pdf
    • https://samtee.com/admin/images/file/juteriwevibojagafuko.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r6nmo4j0v3094hui8n5fmv6nqq/19036739188.pdf
    • http://maristaslardero.es/userfiles/file/64038797431.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e992bb14---34752815066.pdf
    • https://eternalbliss.net/file/gineraxomokuxoxele.pdf
    • http://zbigniewrodak.pl/galeria/file/26907299605.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/ffe82aadb60c8b5e381752cee8c158b0/tajulekixizivowidenadubit.pdf
    • http://climtech.com/files/files/12754641578.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dil+diyan+gallan+2019+punjabi+full+movie+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e254.bin
8da7731f0a44af1950f7fee2af28b0e364f318044b94ca2f22164c68e7038802
pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 17140 bytes
font_01_sfnt_off00010f23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F23 16792 bytes
font_02_sfnt_off0001273a.bin
bcb37b3207717f4479a84a14cf0a664737141895446de4f250575a06ff179fc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1273A 11576 bytes