Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d28dc1c536ba300…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 07:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bda0f9c8e882ee1e15fb425fe7a7a541 SHA-1: cb2cfcf218640551f316f7846c1f96aed7a776a9 SHA-256: 6d28dc1c536ba300d2d1e5dcb9aa26a771ad32280c2a574d3d62ca8f1463ef9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or SEO poisoning campaign. The PDF structure itself appears to be a lure, directing users to download further malicious content from these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=epson+eb-l1300u+pdf PDF link annotation
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/igpa8peq4k277jr5hmtuonkvt6/58785335491.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/notadiwovomigoz.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/pidibo.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/vepalologadunot.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/75769051846.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/11357444870.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076879d5bf89---fovaputaxusurabosizevi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61a2e61ce2---kuremanum.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/12692791531.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/2tru33h7agtib2mao0buaf89f7/97536875540.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/34447319944.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/859eb2db075988e9a043672574355e97/mopijadorebej.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-19/20210519082457435120.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/lidigupixapesisile.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/fisufo.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/mopakazuwumuzaranifo.pdfIn PDF document text
    • http://www.toptehnik.si/images/11548888717.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210708040550_shgwew.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608937ab441e5---zoseti.pdfIn PDF document text
    • http://topas.lt/userfiles/file/99353837445.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/zezove.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f5a792ce---natelag.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/jaxixujofofuxijolotojojas.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/devoz.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_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 10640 bytes
SHA-256: 735cf8c76dbd331a6d51d6fff4b7d7bfab66377f5278d34fe8dd5494672f217b
font_01_sfnt_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 21808 bytes
SHA-256: 50bc08e6882f984490da210061231e2eb74a8201285d0d477583c8ae30817809
font_02_sfnt_off00011fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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