Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ed5557faaff425…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 09:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e31cf5d6b3541c49457d87b26e95eea SHA-1: 69830ef1d68c00289e7a97782eb9b0322bdaef7b SHA-256: c8ed5557faaff425e75913d3535eb8dab1faa28fe3c7032a7726fc4630bbe2f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple domains, some of which are hosted on compromised WordPress sites and disposable hosting. The embedded URLs suggest an attempt to lure victims to external sites for potential credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=done+habit+tracker+android PDF link annotation
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/its6duku10vjoihbi9un4bmu7a/maliwexuvufekupufal.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/dupujezoparisuwiwaguvez.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/21942525215.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/ferewemutufav.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/6897955316.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/48066873265.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/rolonifomevesajuzazedo.pdfIn PDF document text
    • http://anpharma.net/upload/files/61513560936.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/45250136831.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/83515280371.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/tidulorelopasumabubep.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/3692866257.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/39278664277.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424632deba7---23461728936.pdfIn PDF document text
    • http://coolscape.info/images/files/40194744845.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/kimitebubobogusebisogobe.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/55167728821.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/zisovuvagubomi.pdfIn PDF document text
    • https://fishuntpesca.it/file/nirujavu.pdfIn PDF document text
    • http://hybsch.it/upload/file/ponegufakomewojamane.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebefb313e2---kowiva.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/denuluxotigukijo.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/38581213554.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/bivowetedupofo.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/buvonuxisafosonodulitu.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_off0000afcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCB 16396 bytes
SHA-256: 912b4efe5d1d8c7a55f915a9c9a94e5563d7e937f773d441e187530809fe5e0a
font_01_sfnt_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 10484 bytes
SHA-256: 0bb07133ca85abcc67fb3f56f6b309bac046b0f0a2d3874fe91cf204fcda362f
font_02_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1