Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc385939134c9540…

MALICIOUS

PDF

84.1 KB Created: 2021-07-09 13:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 75002ca66ba0ae859a7b759fa1c54e38 SHA-1: 46534b767da3b4ecf55646cbd59ada6380882015 SHA-256: dc385939134c95406a1f8a1e6106e6122c0ff4842afb618e084ea443998cf5ed
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous links pointing to compromised WordPress upload directories on disposable hosting. The primary purpose appears to be directing users to malicious or phishing content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/42903cb2cbea3c18c2a1af1b8f77a283/refabo.pdf In PDF document text
    • http://jnafarms.com/clients/864068/File/96368381571.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ucb8s3luttioqjd3ev4v1tvoe3/31457718846.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/butixorifivuzunuxesiferim.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/rcopd03cd3jr32l0ut9e65ij23/90521507310.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/84290129013.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc380f8f268---gimumapowatowufanepubagi.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608609d4dca46---68463381849.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad86970842d---3042938934.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/munubasejikuninupujimakew.pdfIn PDF document text
    • http://mebco.ru/images/file/wonibebozovuvazarivipu.pdfIn PDF document text
    • https://bczenekar.hu/files/file/8973637859.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/52213435980.pdfIn PDF document text
    • https://tepihtrava.rs//files/18299818485.pdfIn PDF document text
    • https://webmenuplus.com/images/file/44222796052.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc186f2f6a---zonutazudibefelef.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j0doqu1tc478b5a2fc9g0aerh0/danib.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/88231737816.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bae868a89a---63811516850.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/nugurujozobebalogesoru.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4b806b26---lotomanuxusufopoda.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/xefezajijojokos.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/vidavopozavobe.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/71062219047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=african+gray+costPDF 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_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 10428 bytes
SHA-256: 28833fa2ad9183bc7f31ae10dd2bef6c4ae32a5a169f2b6eb51974744dba7f53
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 16804 bytes
SHA-256: 52410f8287614b6c7c3d1af192c27e736aaeb52c8b36a751bbd522bd6a616abc