Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4a90e02ee57510…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 17:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9c4616ea9316fafb6d54d8f4d8e5bf3 SHA-1: 6a8bbbd95a271be53a9648ffba88496f0888229e SHA-256: bd4a90e02ee5751034484632bf8e0200ed00fe7b10c9f622a0d9ca73cd917c1f
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as a phishing trojan. The primary function appears to be redirecting users to potentially malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e3dc5faf---91727201028.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b6bb33e23---kobis.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e8714e038fd66622343ca0a4f45636ea/fogoga.pdf
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/65480344972.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/a799285dc03fbe5713cc755c65b44a29/bijelotituvokeriwok.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607871e0bb3b3---44356850280.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac4252efbc---jevejuredow.pdf
    • http://progfin.pl/userfiles/file/43839689167.pdf
    • https://coastalstudio.com/images/main/file/36706860954.pdf
    • https://abugfreemind.com/userfiles/file/67698020470.pdf
    • http://anma.pl/anma_edytor/file/difulatikim.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f7835319---geliresisuba.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160877b6226ec9---16624800879.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160750ca9d6480---73597904869.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ca1f27e76---59599338770.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/706a35b27a5e311c3aa8d99dc473c805/8148326064.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/b6ossetu3bo2bat3e9d4f9ctfg/wafew.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/dc1f6beafcba4ead3744ca95134218ec/86955534595.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2201f65d765653851bc8af4ee8035b64/24531465639.pdf
    • http://lungshingcentre.com/userfiles/12139905306.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/9463j3sofc1rvc8jl41l0uglb0/foxadeso.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ea3b8995f---81072314882.pdf
    • http://miraesusan.com/ckupload/files/52135118579.pdf
    • https://bbpartner.cz/userfiles/file/23131995374.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b83bec37b010c9da855c3bfed6ab193/zuzuwedumafoxe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+undertale+for+pc
    • 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_off0000f096.bin
67562f7dc63ec68896a179243e7c13ffbd4c66a08b5acc7f4df50d257a0bda32
pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 10540 bytes
font_01_sfnt_off000108d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 16792 bytes
font_02_sfnt_off000120e5.bin
1d36c67980a2221b14c86d64dc7f47a075df60f08783d36bb17caa1b360476b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 16932 bytes