Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b31242a61f86b2d…

MALICIOUS

PDF

84.9 KB Created: 2021-07-21 12:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 174e33f530afff9de9016617889542d0 SHA-1: 120dc63cfdc2f3fa1a75a48cfb8f73b67436b695 SHA-256: 9b31242a61f86b2ddd2625fabb5b1bf5735bb987b1e296e2358d32e47589463e
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a raw IP address, suggesting it is designed to redirect users to external resources. The PDF structure and the presence of multiple links to potentially compromised CMS upload storage and disposable hosting further support its role as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/8hqfve2e8bs9ckvbjlbnammsh2/1705221031.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/28f69c89f90246f7dd31781149b73433/piwazizadobunirogek.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eafe0a069---kuvarometexurol.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/forebom.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/11be1e101fdd1e5d4c05feac3e7ee65f/sifexesiduz.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160765f1de053b---zusave.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/gilexodapogavazora.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/46805029626.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1802cf0e---94072772301.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5fd174446---nakogoxepebobekatofuxusud.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/dfeb354f9b6e466de556eccae229d928/gitabarikavidolel.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/dv9b37hlvjcf2togghnk6n1ksf/lazovusefi.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/185149006.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/wonelatijozebowu.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/9d207f9f8e1fd59949f1d556bd24e9bc/34047683957.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/41910502450.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1625442987.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/29865119316.pdfPDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3fe133ed876484c397c05d107351f7b1/fesivatutumazogotigo.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1623897735.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5956e0559---wobovafavopetimizejupub.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/mekamofapunadar.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/mukotilipanekuzozaton.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e7e83af6ebf68df41ef1f9435ed618d6/vemulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=to+give+tributePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 18472 bytes
SHA-256: b8e5846d63a6498d66e4900accf10d8c4b34fc14a493ee4bf1ca105842feac7f
font_01_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
font_03_sfnt_off00012f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F65 10072 bytes
SHA-256: df44709718010c353ee1a1fb4ce5f88ca176d60789b7c53a41460f1e38681db5