Malicious PDF — malware analysis report

Static analysis result for SHA-256 0037606c811ab211…

MALICIOUS

PDF

89.3 KB Created: 2021-09-07 21:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4571ca5ac1733ab63d25f1af394a69dc SHA-1: 326764fcbaa660ec040649238bd340c815aea95e SHA-256: 0037606c811ab211e95793cacc2ba47f2c3c30c2ea110c91bc3b043caad9e224
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of numerous external URIs and the nature of the hosting indicate a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=darwin+awards+book+pdf PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613273f70c1ff---68279608622.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d7ec98132413b7cc566f5e8683a5490/68072079045.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/nuwibila.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/65806214068.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d7b664a8ed5---69974396326.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/106beb7d23c65a1cc1df0b1879560ce9/45261771781.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/wopoxoligobobepo.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/16005296107.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/parivarogusofejasebov.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/82466937566.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/jixopulukitesakaru.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4533d8a6f---jevimedu.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfdaec2b6c---josasidonagilikufowex.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/31884313877.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/72875310374.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/96252234954.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba92b9d9887---kakedokuzunig.pdfIn PDF document text
    • http://calisnt.com/uploads/files/diwuzekudivixuwon.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606dce50acff2---kezizinaperej.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a091416b5d---livajabufanuxoj.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5fl5cvagphbsj1h1sakp535e7v/7074176328.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/nemikikixupivadegi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608215a61c043---87179490665.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8a0e7f97---garovazafobagipowewus.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085075bb77d2---88035623662.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_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 18492 bytes
SHA-256: 5e671064e9ddca633df940cdc9d0bf49bc5d8122b46b91e20bcea0ce4dee1881
font_01_sfnt_off00012767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12767 10532 bytes
SHA-256: 4369fc4f791df2bf66d045c04c1c448e7db8b0fefe66da3ef9e7a2304e8a3d49
font_02_sfnt_off00013f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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