Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d9a18f27cb57a7…

MALICIOUS

PDF

89.6 KB Created: 2021-06-27 14:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 909e456957c99a5ff70ed4cfa415bc01 SHA-1: cdedcda8efc63ab9fe52d6bd55b81000e5d059f1 SHA-256: b1d9a18f27cb57a7c18752b4512cb56aa3a5ae04a08b68b1d6765f6c9e547589
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://catamma.ru/uplcv?utm_term=sweet+and+sour+pork+rashers
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982b1d3b617---66307464491.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8ar8h1dqg3ap2c4nm15h2saik9/97292038009.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3fcca94668b55d1c0bebf424974db36f/78227344255.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbc5919e8---28304747798.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b17a0df16c3918c5501c7824a43b050a/zokidaxexuxoxasewokusur.pdf
    • http://igigeothermal.jp/userfiles/file/difitoguvilix.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a2779b7859968c5f31538dccff8c92e4/palinuwizibizapibubotid.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/jarepanakivemawoxegure.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d462b0e7---25098450768.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086f9e9e95ba---62066822151.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8b882891b891d9de22d621e7284471a0/wejupowamupitazijemo.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c51edaf1ebf---tozafilapokezogudi.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a617d258764---fowaxozujukanevimojesiko.pdf
    • http://zigzagontwerp.nl/sites/default/files/file/58087848119.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/96538a1696a41aeee87ec23cdcfed956/rudonuj.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b46da5e9f83---63851787119.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/27gj8o5hpclelre7ea5hrm7b4e/70945045307.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078abf81e430---21189144523.pdf
    • https://holocaustresearch.pl/nowy/photo/file/61139675067.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089d2c1b9154---33395614172.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/l4dijqnulvr3nkmabr1713l4cq/37124926388.pdf
    • http://diysmart.net/userfiles/file/desupewir.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f812.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 16792 bytes
font_01_sfnt_off00011024.bin
963eb81415511da3d9ccecbf4cf31781b3381150711173df0c53cf501b1d8cbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 17968 bytes
font_02_sfnt_off00013f34.bin
fd28fbf7e9c5236aa771185d438cd3df0566a9e242981dda07fd18925d6b6d07
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F34 10704 bytes