Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f026b7f6a979d4…

MALICIOUS

PDF

93.6 KB Created: 2021-07-21 22:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b2f6fdda620ddcd4e926f7d07eb4cf53 SHA-1: 4020e4107ed2f5c75bca65d73e1be1e24ffe555a SHA-256: 20f026b7f6a979d47d2a877b31cef4156edf46ba8669adfd02a5c6be66c61b58
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it's used to redirect users to malicious content. The presence of 'LOLBin token sequence' and embedded URLs points towards exploitation techniques, likely involving client execution or JavaScript to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d7d4c864d59e9411bc89e198471daa75/14476861018.pdf In PDF document text
    • http://kalmi.ru/upfiles/files/35107065072.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/49743299659.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/v54ohp5la3svptfun05libncu0/6682338414.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab055bd98b---norajazoxake.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/terulizi.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/44997197679.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98583aeb0---46377755616.pdfIn PDF document text
    • https://cristalensi.com/public/File/salajoxerepaxas.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/soguzonoremulerapegesel.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/27369746246.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/visefirowotoletare.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6935dc419---fisewadebibaxetejufafep.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5496009ca6---98406360470.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/febasopalejosixirusi.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/9001231466.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/kujezugupidamesufolaje.pdfIn PDF document text
    • https://highrise.pl/file/kuruxesowanopire.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608588f4a09ce---xifidufatasabujulobazi.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/965c6cmdikpq8t4ard63oocda2/70956039916.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/cd8729fbcc706cca46292993789c7bb1/sixixes.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/tepiwuxuruzavijaluv.pdfIn PDF document text
    • https://www.focus.mu/wIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fire+emblem+character+rankingPDF 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_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 10600 bytes
SHA-256: 99163ba7de9a3ba74a1c75f1ef56fcdeffe5cb489177f8313c24f626c90c6b1a
font_01_sfnt_off00012541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12541 16632 bytes
SHA-256: b7c613550491870fd9af85910fe63697e4f36fe99df913d40363c65ef6ef4fcd
font_02_sfnt_off00015083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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