Malicious PDF — malware analysis report

Static analysis result for SHA-256 b510f378b17aaa7b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 03:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b12b5a28e1535740332af7c75bf26ebe SHA-1: 833734a6918abc05d49d636b80484eceae1902a3 SHA-256: b510f378b17aaa7bd9a70f03d5f19b9221ee8c9e777e11087f125bf4cbbdad82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=tangible+assets+and+intangible+assets+pdf PDF link annotation
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608130068fde0---93862536050.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/026a0564f54496299b2a7e1449792b85/luwewilutawak.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/52355118921.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/79469811947.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/19075875972.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8b471331b---kalupazujanonidepixifejig.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ac8b3bf24---supetuludofupigomugememe.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/19495344578.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/97046530876.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/5027490234.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612b5c3215459---99642095497.pdfIn PDF document text
    • http://nhs1968.com/clients/65482/File/dudonopilugize.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/42248c63d1836b216b6aa07ffd1376bb/19287418100.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/miberedapavotagalato.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e2ea42d9f0f5056cd92b21847cdfea61/96082623092.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/47677722202.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/lifozumategivusexepogagog.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/9442436203.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/tijinupebukupikaj.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/logazogejabazako.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bcdd038ca---xusumedugogujigufiva.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_off0000c6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F0 10556 bytes
SHA-256: b5e493bca2c8be3b41fb47ccbfee10f790520dea77f785cb2d4d158521571efd
font_01_sfnt_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 17884 bytes
SHA-256: 60130ff766d0a99a3ffb3d9a69a822efcb9808f5b7cfcb4b41272cf8e921548c