Malicious PDF — malware analysis report

Static analysis result for SHA-256 613e4f7e54e89c09…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 15:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21d4f58c554b974ce41a4799b9446e8d SHA-1: a2fb6bf510a8d25768ca8fd61215db4576307697 SHA-256: 613e4f7e54e89c0954ccdaf4dbe98c256c147f29edced7ec630d3bf59373afa6
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it contains a link farm and a lure for clipboard command execution. The document's content, though heavily obfuscated, suggests an attempt to trick the user into executing commands, likely to download a secondary payload from one of the embedded URLs. The presence of multiple compromised CMS upload links further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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 http://resurrection-life.net/userfiles/files/88171333973.pdf In PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b60fc73d68c---78880252160.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110f95532c46---jutizekome.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd3010512---86775281401.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/lavufowu.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/33164661582.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa1ad6654---24619876911.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/buvoneniv.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/7i5jmneg0p99bagd5s3dtiklf0/lojojukenub.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/sujilewap.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/93983804137.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/pezalilimisikozaxa.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090722fc39c9---8195534332.pdfIn PDF document text
    • http://khocabien.com/uploads/files/tilerigerogibovupozax.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/rubatisunu.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1de3e1c3ab---9075646432.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/99029064353.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c056e5f1a0c---63893875723.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/jexowugosajawujeka.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/13788738921.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/foraloj.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/jetosixarupumi.pdfIn PDF document text
    • http://splogservice.ru/content/file/83811705980.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/b3d9nr4djrhlf4d5jquilrf317/36974834765.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/savevumuvakupewegal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pindah+file+pdf+ke+jpgPDF 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_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 10512 bytes
SHA-256: a42d7b237433ca1ec29f1f0057da1c07a55a582af316a3a9140c1efc1136509d
font_01_sfnt_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F6 17800 bytes
SHA-256: 493f387f48989a6508ae43dbe44fc66db8e333f1d66ae72689afcab5d267ffd5

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