Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb083547c5e6d0b5…

MALICIOUS

PDF

83.2 KB Created: 2021-06-17 22:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fd691d21fd4bf2dc9a12af1d2d3b9c4 SHA-1: 966fa89fefc19e27a4a54e89e6ca65378af8c6eb SHA-256: fb083547c5e6d0b5a23070b2f861eb857e6c3b1e118d6b717556cf6b779c118d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The embedded content, though heavily obfuscated, suggests it is designed to lure users into clicking these links, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6498f2c3abbc32cd45c4d4982cdcb04f/49015513409.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/no9dmie6uto1r2e51bk50vn84h/rowogupubovofunulifoseker.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/368d113ab98d8e98eae9ed125b5ae959/53661131116.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d388bcf7f0bc2c0e0627c1bafc9557b2/91901771107.pdf
    • http://locnuocvietmy.com/Images_upload/files/93115014427.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/a10vc32a4vrhndefrqmckrnfr1/saxololuzuv.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/4fgb3g6o9vm9fo34cvcmnar294/9128850723.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1cd48d26c---lovafimifa.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b6819d09252---99986277359.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2eqcpbhnjuoojm42pn9thsi0p3/jumuza.pdf
    • https://matskaren.se/anvandarbilder/203/files/38236347006.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/bdqjlm41rppr7ssbktor3j3fsc/fikutiwamiwexaxofep.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160756a6353cb6---13412219498.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/dakarurepaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=base+level+6+clash+of+clans
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd05.bin
6db00f1ba1f0abfd0ce94a79f5dde06d0712cb885d0fc8969da18a25983ac201		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 5136 bytes
font_01_sfnt_off00010e83.bin
1a02017d8f9dfccebdf658a6e57aaf3f1db45e167806d7a7e54ac7b5b333925c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 1956 bytes
font_02_sfnt_off000117a6.bin
31dc9140569bdf1e0a43474230f47388d26f241ba50d801fd772fbc972c35bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117A6 12292 bytes

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