Malicious PDF — malware analysis report

Static analysis result for SHA-256 540f5da88eb6f9b4…

MALICIOUS

PDF

108.4 KB Created: 2021-07-02 00:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9aab5b79ca19a0dd385087c93451ff25 SHA-1: fee1d03ee6578980ecb7a994d6380cea9773db19 SHA-256: 540f5da88eb6f9b4134807a2da70c1c7caf2a932ae4feacd9a212f0158ba5fa1
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, indicating it is likely a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These links are likely intended to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://picinterior.com/ckfinder/userfiles/files/zodapewovakej.pdf In PDF document text
    • https://careersourceokaloosawalton.com/files/public/vexifodokafitadig.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/906fb9eeaf18bc166b6e3474cf162c05/lozuleron.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a1af9c877055672624d350514e5966c7/1094505858.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/kogutavusojuranewe.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/161091a06da41108e0bc303e971d2f34/46390757830.pdfIn PDF document text
    • http://planetamama.ru/files/file/rodaledeverenum.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2af84d862---15758073188.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba5d4ef571---25025675000.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/murora.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8aef8eb2d---robar.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609839d51b4f9---37152704916.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/11745363874.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607802b57fd41---sexesewovolefudib.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/32299132496.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/75232333897.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a335fb6f680---25879276631.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/telamavevifurakasuror.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/54317489526.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863cda550bf---60529031055.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bff3ca1131a---nelak.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7284612765---zexomizusokomusubijifi.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/xibil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=a+textbook+of+environmental+chemistry+and+pollution+control+pdfPDF 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_off00014390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA7 11480 bytes
SHA-256: 9c781ff320d443617e9e6ac80b9523d85cb818454ef28c13ed1e5b76f3fe7463
font_02_sfnt_off0001767f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1767F 17472 bytes
SHA-256: 30a0213dca77f274a332f7dec102ca3752a5dbb98f7b04eed85ca0acff2cd7e3

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