Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda37c9405b8e967…

MALICIOUS

PDF

63.6 KB Created: 2021-05-19 13:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73fc4224e0a35a555b5087f328a9176b SHA-1: abe36bd864a1acbe90ade1610c42c03ba9bb088a SHA-256: dda37c9405b8e967d50ddb8466370c8e769f15f9ba51ffbc60aeba1f3df9dd92
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, many of which host PDF files. One of the heuristics indicates a link farm attempting to disguise a download as a missing software component ('vcredist_x64_2008_sp1_x64.exe not found'). The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 5

  • 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
  • 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 https://activepymes.com/pub/file/3622589899.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094391915e54---64443304150.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083e653ddafc---wutipufe.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079284751cde---46036229329.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878e234e4af---39923184397.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/c2asee11k3r4j5b6v99iu8oocu/ritazunikigetad.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c60038bb7e---takabamubevija.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fk19uqjlig8qcqcg8ag1mkmm40/bokuxanuwagifozukepuw.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/036210a0adc652fe30358896cd43ef6f/11932081628.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ec4q6peqd1f44rj24ik21iier6/noxurulosewukilibilumik.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160985aa1bea5a---14613938857.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/o0ut7uu7q21nt02kg6ak7q3ta7/siderota.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/38b1ac9c91e57a99e4384d263c8e5ba6/56333789605.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/98037eaee84e9c4b99dd3ce08a0e12e6/pezisalufobobefipadununaz.pdf
    • http://caphegiabao.com/upload/fck/file/2636674588.pdf
    • https://a2designbg.com/userfiles/file/gejejujewa.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/bea1a1f379c7ba846fca8732ac2e9989/2040296843.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=vcredist_x64_2008_sp1_x64.exe+not+found
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d852.bin
f50271eb11973c47c5e4c327187afa835a8dee809240c70ca7428d0024310226		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 5764 bytes

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