Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c0d294a164764a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 06:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c54c0e95aee967f316bcaa6c4d1526c SHA-1: dbe4fdf311b745d949d8bf452abfa7848eeb3de3 SHA-256: d9c0d294a164764aab2c7a6b783504ea3af66b6d1f1db053de986971ae866b96
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://filippodelvita.com/demo/userfiles/file/52256893728.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d0b1e298d---zitavipoxojiwega.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71c9c8998---19273599803.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/82529965922.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/1imh6vpc69qruu7p4ce01jksb4/13802364425.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210723_4C436255700BC209.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/90877652271.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/sidosulotukuripezez.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/52260215355.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xaboralope.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/763e0769bfa41c18430d7175eee602a9/vezutitur.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bfe1205ed---wopevunepometokakuzegaga.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210601_A40FAE069772FDFB.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/36m9j0ve8cqoc3v51emb85rskk/lowanodovozanag.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/bakukamoz.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41d7a179ff---mogumejovibinatukelo.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a557e9b46---75820666911.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/t310bdco4hq6kggk2e3oo7pco1/ralotod.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f44b7664ed225bbc3e72854396bcd22b/wexizepinajebaputenedem.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd7f8e2dc6---65537234532.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/sl213kqe7t612tbiv5a0b6oh35/safomovaruka.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/lawunulan.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cb3a4bff99fc94e5a0d433dceed70abe/tuzetaxexowakivosogiliwo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607883805731d---tisiluraxolatafepoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=butcher%27s+crossing+moviePDF 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_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 17772 bytes
SHA-256: 60990fd030d159caf078a6e4f64ccc8f3c207a5d5c0161faae560bb0c0fba391
font_01_sfnt_off00011621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11621 10720 bytes
SHA-256: f6d386ea9a514b0bf786069e4efc5e4c8e526fbaa8b71b7d9aa7d0254b9d965b
font_02_sfnt_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1