Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b75b5909776355…

MALICIOUS

PDF

74.9 KB Created: 2021-07-02 13:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b0b83ec0825765c538fa9a64a9352152 SHA-1: 05611b14d7b2f0b13f2a7038de6313f8c3294eab SHA-256: 86b75b590977635525cd61febcfce731d5de3d8f8cc610f9eecdcb64b77c79db
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple unknown and potentially compromised URLs suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3b1625595e3ce651ac6f08e1ce2f96ed/83938650538.pdf In PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e61df357beff90972ec1523476ca8513/bodunoj.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/55722193693.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/0i31l6ujj5f04jb5fp9g2ain57/jazikok.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/dutage.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/9c1f50d79ba90712c6256548835e9c38/86001251996.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fd6e38cd593ab5149a5ddb5681982bea/99143903647.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b093158958d---84389536900.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/mozobivesowafotikilulepab.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/262fcd24308bb47a8b49bbcf3c0eeb0d/zidazebaritebo.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/gonamofuzopawusoxukinonat.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39ac9c25e---tugoximewati.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/79157893889.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c0b74204a94d4542bb350c996a1de720/71700901881.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8f5ed151---56814085432.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/9585639359.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160759708b09be---losuwum.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/im9234kr1bcjhv33h2in7v4c4a/legunesezuxaxokurusewi.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/43104422653.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8f15ddbd6---77205277419.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/10639002088.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/mivitavikex.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160754017649d1---vebarokululalube.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a46ba528b---nunuzijig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=an+introduction+to+game+theory+martin+j+osborne+pdfPDF 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_off0000c2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EC 15752 bytes
SHA-256: 0af613a6ad7820d4046239fb0b4f11072644536a8b7f2d80062f97a69cf174fb
font_01_sfnt_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 11488 bytes
SHA-256: c15ded7ecfc49ba5af44a43134c78f3d95fb8a8f44ac8062c4e066de6a92ff62
font_02_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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