Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84dc796db0c3994…

MALICIOUS

PDF

79.0 KB Created: 2021-07-07 23:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4d3970785dc92c21e8c1e55f764c5023 SHA-1: d3436d7b18ea1837d46cbf848ad1d47a09fb17ed SHA-256: a84dc796db0c39949a758c88f415b1821a493aae09dd2e40417b9413e5b4bbb4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to copy and paste commands into a shell, a common technique for downloading and executing further malicious content. The numerous embedded URLs, many pointing to compromised CMS uploads, further support the malicious intent of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ug0161vhicoes058rs24gk20s7/37050340365.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd60faf9a1---1491712756.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/3be21e082ea29bff7ab9d8364d3dba3b/gagepenodiwexomivo.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/32666633061.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/96ea457356d64eaa26943658fc9247cb/54130398615.pdfIn PDF document text
    • https://epiphanych.com/images/file/85333988388.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35ec79abb---63070254754.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/e6u82558v8hn0p7lnscli4d3a5/25856961609.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7cf79d31d---63926084582.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/95126378422.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/rewavaxasejip.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/e64734e4a6d58f5aff6906ee82e469f1/29555988006.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/17232543168.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/27794448279.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4pta5gns395727eulij2r7ob2q/87853710388.pdfIn PDF document text
    • https://flomogroup.com/upload/files/tejijelupagolovi.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c9ad7327---wewufojopes.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/goniwunosezaguzikobili.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/5bc57e3b97fb1e5d4b299f57c7c2a31e/98156139206.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/pebawakoz.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/27foamp2gm1lgp8f98cu752ph1/wubasapazimadorokab.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/15876106746.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d105bdfd71dd9d0fd8a6b1e85e3a0a2a/farigeso.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/dntjlbq4the1c1tb6ihtoj79m5/71208082780.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/750b72fb48cc60298dc27a660eb7ffa3/kajaxitabonewe.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/zujuxumed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cny+to+php+pesoPDF 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_off0000d138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD138 10092 bytes
SHA-256: 657a94de863e15fba62e229e6f5119babbbef386127095731a998e8fce9935d6
font_01_sfnt_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 17780 bytes
SHA-256: 70bbcdd0afe7586b98c19b4fbdbebd01e6dfd54763498772d312826f9ac6d483
font_02_sfnt_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1