Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb2fa072c68aeb5…

MALICIOUS

PDF

95.4 KB Created: 2021-06-28 14:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8c214553d7a028945bb1925620fabe36 SHA-1: 86a4700dec65a6cf6ceebaa8b64d527c29686693 SHA-256: 7cb2fa072c68aeb57ad4709e3f38fa8f9bc17f5a8486d6703cf6fba27caa6bdc
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to leverage these for distributing malicious content or for SEO manipulation. The presence of external URI heuristics and the nature of the URLs indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/9a69b89f8f61cf6b5ee0d5bcf872a2d4/14168707394.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8b33c49ac9670816269bcd20220b52cc/gikopamud.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed2b7c22ab---72498748348.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/19770385780.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607977f9676ec---sifomifopovemebaz.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b605a2bd0c9---nusivukoxuwan.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/248038ec43501e992ce606781979b5b8/dofojaditamijewuna.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/1153278339.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/44017870600.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160764032e35e4---4150957356.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d3c8ad39632965f8b9dbc3b9e5db08b/vazexasofaxowojasox.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160be0789e9727---zufopifig.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607578c793f95---96688482153.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/72c043a8c72cddcae12c8ce9f719b256/6874102327.pdfIn PDF document text
    • http://mp-journal.com/media/file/92925033419.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/02080be8857e0294cb93055993fb9fed/64222306888.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b02caf426ef---71274590127.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b12cc8312b7---85268185578.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d834093ef---62779182871.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wuwokokewiba.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/sovipasevanulesetaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sable+holland+lopPDF link annotation
    • 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_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 17920 bytes
SHA-256: b42ae1105348c86761b5946b43729827326caac30b7071995352b9ebf32a695e
font_02_sfnt_off00015a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A10 10248 bytes
SHA-256: 9b68d96b778ebd81298d8ba2b3823862ebc1e1fbb9a61c841c8cd678151fece9