Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfce58837f76ab74…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 13:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0ee21a88ebf29095b09bafc7696aa4c2 SHA-1: 3c9c08c2a2836eda2ce5cd993204b91f471ae998 SHA-256: cfce58837f76ab74f2824b505ab7cb535e2b4689e88b58bc1dde6627e12c652c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the nature of the link farm suggest it is designed to facilitate phishing or distribute further malware. No scripts were extracted, but the overall structure points to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=free+minecraft+premium+account PDF link annotation
    • http://xycrusher.com/d/files/67971159572.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/98430424199.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/fopapedumurizolusexopasos.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/7189801211.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/57420448617.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c1a3ca96543efaf4db9d7dae1a825fe5/vopafiwasifixotofeveze.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/68549486632.pdfIn PDF document text
    • http://schokobrunnen.com/idata/96768525960.pdfIn PDF document text
    • http://gaudi.tw/upload/files/13793075866.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/84942216588.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/3700584597.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b4a668b41---sanufukasemikexifebe.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/janidaluwaxikotejagunemot.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210914_062201.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/ferisukijezubogilijuvu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/107d9d20333b7d2815b53d5cdc488fc9/gewomu.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/11838355528.pdfIn PDF document text
    • http://timebymtm.com/upload/files/bisexeto.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/pajagexiposukanajar.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614061c9d6065---1170706708.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/18406104403.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/bakinixoki.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-16/20210916061421165897.pdfIn PDF document text
    • http://secretinvitation.net/images/files/58756875943.pdfIn PDF document text
    • 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_off0000b149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB149 10504 bytes
SHA-256: aaf38e4f6c1ad7af178b6afff2cd7c4c3fbf5af9d40b997f5a49cb38e65f5e77
font_01_sfnt_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 16304 bytes
SHA-256: 510673a52ebedf82512d2671d95defb28413fa45f9b32ed900bb802d53e3095e
font_02_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1