Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15c882947783723…

MALICIOUS

PDF

91.0 KB Created: 2021-07-10 05:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13d62dd183214d693d19140da413aea7 SHA-1: 88eaf8c4b01ded7f6568202363cad487db37230d SHA-256: b15c88294778372307a689f5a2da2268c1e298427287bb27c4821cfe8d7ab7e0
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ukrainski-rosyjski.pl/userfiles/file/53607483396.pdf
    • http://faradtvandor.hu/picture/userfiles/file/nesim.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b88d506d1d5---zewexalox.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/935a15ba1dc4d3e2bfbd43627ae01072/torikiwetupijogate.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/65949027254.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf46a7e3692---nagonebexafirabukadefe.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/db10138aa204cd2d794eb99785ad193c/fokoxijufimuvepugowos.pdf
    • http://heyumpnd.com/userfiles/file///dazorugatoraso.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/58cbcb050a4c1f305ae6bd37b7fa60e8/92706319643.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/27354ac510613085df9df03e3081809e/85811335794.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160714e50cd05c---foxexufusigubesemu.pdf
    • http://csc020.com/userfiles/file/20210708073024_a8zvbm.pdf
    • http://delve-cr.com/uploads/371740389.pdf
    • https://aimara-bg.com/userfiles/file/tulox.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e64f6124f33---jigig.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///75415760670.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba9c5541d---paxejekiwatafuvevos.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d82c61b1b5e---zoxoxekorokok.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8869a9492c---55108283835.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5dac45695---88330706233.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e72fc6a0fe58c992a5f0ac7defe067c9/77789678475.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8fad2a46758b11e990d8190aaffb281d/zabuwiwo.pdf
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/23900541667.pdf
    • http://footstepfloor.com/upfiles/files/54597780190.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb367d619d---31976916749.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=songs+about+being+nice
    • 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_off000102e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 16792 bytes
font_01_sfnt_off00011af2.bin
e06a714fad61f198771e2febae0e6400baee52a98eab019fa8dd050b3b00d897		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 16928 bytes
font_02_sfnt_off000146d0.bin
99bc6f1aa6d330c88d04656550445b27b940cc4804178c2da234043bc71a60e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146D0 10576 bytes

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