Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8bd5e6bb1f0831…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 15:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba1ad7283acd9261c32e58255fe816b7 SHA-1: 73a26339371bb3614c6e7dc9e3f2d0e46487ee6c SHA-256: fd8bd5e6bb1f0831e8600831a5d3517ab0662180ced6ac7253a9b9f2f984a789
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest 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 0.9952

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://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b89f0ed01---59238964051.pdf
    • http://modellszerviz.hu/userfiles/file/6492840579.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093099953ce0---vasewenovujek.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/rgv4kgr2a4banlhp8eknfo7j61/41059377604.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e817b20dc---61771001473.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a86a197b81---40009829437.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/binitusuguruvuvobutixogo.pdf
    • http://www.findvoters.com/userfiles/file/80953097703.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/418ec03b6f618dae8f5241dc18c29a56/fapomulifez.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74724c37e---befevixuvuzudo.pdf
    • https://langestrand.se/anvandarbilder/204/files/32301433906.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/xitewemanarivotusa.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bf556b922---54774540140.pdf
    • http://thehigh86.com/clients/13680/File/buzipokegenilisumasawof.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/su128pi5c1p7g7evuchi78edcv/lejuperod.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3df88a777---wokepox.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/jegakagisexuji.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/93136e5d773ca2b4f9e73291e823fd57/61806525263.pdf
    • http://humanlitech.com/files/files/70137692693.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c10e8b2cc10---tadanapubevifokagonoka.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082a9a686889---50857242680.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bff0b52a9dd---tofobovuku.pdf
    • http://cupta.org/userfiles/files/20210618213030.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=serving+of+oats
    • 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_off0000f7ee.bin
5375311c26e19afbcb914aa228db2c4657c598822147a6b7fff27c55d61d0380
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 10484 bytes
font_01_sfnt_off00010feb.bin
5a7195b32292b2c4f3737146b10f0a26aa49c3c17ce99f428d0b3707b1ef259d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 17076 bytes
font_02_sfnt_off00013c40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C40 16792 bytes