Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b84bcb8aee4f6b…

MALICIOUS

PDF

136.0 KB Created: 2021-07-03 00:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 269b31007e922050a9355ab1e43eb4e4 SHA-1: fadc5dba6964f16cca0b75c8e7c81bd0a86d9a83 SHA-256: 20b84bcb8aee4f6b6e1ec57d12a06834301696a7aafa05ca31515152521a5b02
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of external URIs and link farms on potentially compromised CMS uploads suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/41ktujvc5ng9m01nhqcrh51e8b/46601900717.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/rikorobozituduxikone.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/glb4fjjp09774cql2nf6n7i497/30085519349.pdf
    • http://rheumatology.institute/upload/content/file/72128805194.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/8d3fc9b8b316b08032c2fe9e22dacc65/jitipizoko.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bf61625b19faf0ff9981a7b0198fe23b/jadugidebanilekojasibo.pdf
    • http://vivatbacchus.hu/files/file/gemuza.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/de13c05e15d6fdba868a44d1248ae413/denenijofof.pdf
    • http://halmar.info/userfiles/file/2906954725.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dece98c254---78630486672.pdf
    • http://cnc-soustruzeni.cz/files/file/gapamaxavefuluv.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d01bef57e63---91572770214.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/489390492ba235b63d54d6ae1da4d00a/xesumalividefezin.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ehm1veuf5t4e0uioaja886r505/36039520788.pdf
    • https://cvsc.co/userfiles/file/63881098822.pdf
    • http://thaide.org/userfiles/file/60945260541.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/975e78e86f3e7eba49ff219878570ca8/kuwajutebejokilamopalufen.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160857dc751722---35230175886.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/800298a084f233330f757649c8f63f1c/xevepaxomizad.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160835c3b56c4a---72089372710.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ed860829---67196737701.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/u7jagith0soramc6n1faiedc7c/46146285944.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31979b32d0---dojediburular.pdf
    • http://almar-bus.pl/userfiles/file/gizofosi.pdf
    • https://hunde-katzen.at/soubory/sesatukejuvul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=inside+out+2+2020
    • 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_off0001b315.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B315 16792 bytes
font_01_sfnt_off0001cb27.bin
c314e0224a9bc9fb04f83f09df743267d35d87fefdc7022bd897b1067a51860d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB27 18384 bytes
font_02_sfnt_off0001fb49.bin
782986437e54478ba2ad0bd4fc65a0994eaebcb08a5b97d4515fd945d5764d4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB49 10224 bytes