Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c1f38c53e28cb5…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 10:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c26ff3c63ad3d00654aa43fb52ac6e4c SHA-1: 4f4a2cd9466e0b98ea65c02bd3800860b847e285 SHA-256: 91c1f38c53e28cb58c743270b50a11b9337291440b026c3e939ff30e704ebe47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, some of which are compromised CMS uploads. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ca8235baf203b70503f2e796e420909f/83059516214.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/71a2daeeadfa3ef23f5edae853c7f9d0/jexetibiwi.pdfIn PDF document text
    • https://wrd13.com/force/file/74740748878.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab7aef776---juxugorolelefisop.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/vgvri3ho8u789dumomri1lu4v8/pabosumavonujozovologewu.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/jeseludevizizi.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5328035ed---9983344657.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/91850145778.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/78337688738.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/28068916703.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b90141b9984---47443942754.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/55936837811.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b33a51139b1b21d7b2b6935179b99bec/nuzesesup.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/tv6rkso5s0jfuink05a7kd00cq/78186471084.pdfIn PDF document text
    • http://chinazzjx.com/d/files/98251415234.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/bf9f87af20cc5c7d88594c71f89e8d79/dixelifixexi.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/7uffg06rl90ph8h9nuh8hued0s/59374336201.pdfIn PDF document text
    • http://mcutech.net/files/kaxuko.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/cef1229aba67723a9a6091a0c7b4d753/10619041678.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/namamekofiweb.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/85145394090.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/507657d85054721ce53a94220bb0ac8a/semopunorunudofijoporapo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082831d61fea---momofevagawusa.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/tagofasunameros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=support.swann.com+dvr+4980+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92E 11420 bytes
SHA-256: de4280634c6b2c337e138496b0b8ef72adbc46b4715bc97f966837db9e19cb11
font_01_sfnt_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 17276 bytes
SHA-256: 424109aa0af09beeae2a4078a9eec4e09ee2239b895bc3ed5284eb56012cbc82

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