Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a52502560d2257…

MALICIOUS

PDF

99.0 KB Created: 2021-08-18 23:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22b3a1a56d4678e9e492912b607185a0 SHA-1: 6753556d4cdec087800c32b551e26addf864dd2f SHA-256: 91a52502560d22577f191d6888598a33fbf7147e1c92f83904234a3e8bba94d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The primary goal seems to be directing users to download files from these suspicious locations, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/bogigewazubonebigolenex.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/jepuretipubalap.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4af1f043a---gekodef.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/o29ts3nqgfnkttr4c1p0ab7d5o/25798950286.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111c45b039bc---32790807287.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607857d18c07c---26578334854.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4mefm1jjfitd68qm9pouu8q49s/72259758899.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/buzagi.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16083a31d3d394---rebinode.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d63474f55aeb24b282dabd6375dd3c4f/20898981742.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf562215bc---60782226162.pdf
    • http://iwort.de/userfiles/file/fexulobokupulogirupogejo.pdf
    • https://juvelyrikoscentras.lt/Files/file/29792396614.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb10d0770---jososibebigup.pdf
    • http://stacjaregeneracja.pl/userfiles/file/kakebeluvoz.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/b129a1762d36524f29178224592a8a8f/pagire.pdf
    • http://www.huntsvillepr.com/files/files/vimipo.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2b4gjv6u0q0u5coh2e8llan2ri/wivatosinuturamupite.pdf
    • http://bagliodeimille.it/userfiles/files/xudazuxokabanozewepusevex.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b30bf566c13---17761749115.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=adobe+audition+1.5+full+indir+windows+7+uyumlu
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e705.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 16792 bytes
font_01_sfnt_off0000ff17.bin
cb77c926859ecf3aa92a71279f12db432b4a6b9786717a179544374f952e408c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 23052 bytes
font_02_sfnt_off00013242.bin
d9c732ba8ac1fdb1c3013808c2bf51b48527577232d08c03581b24ac4e6cd0b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13242 11236 bytes
font_03_sfnt_off00014ccb.bin
b624d23e3f0ff10a3f091a9387549bf532fc0aa18e32d0a8de431d9a53450b88
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCB 16472 bytes