Malicious PDF — malware analysis report

Static analysis result for SHA-256 c370c59034435412…

MALICIOUS

PDF

91.2 KB Created: 2021-06-26 17:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10c56c451b7b2b1759440ce43fa697e5 SHA-1: ed22498fb1839da71283b0c11a0d8a247b4c59da SHA-256: c370c59034435412f78878595144be1672453c0ca2f5bea9cc186a36bd32d4ec
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and link distribution suggest it functions as a link farm to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/tcijpv0q9846i5tl44tr9o943p/bowegotuxawatefitigevar.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e35abc74---10222139262.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/vidomofimidamede.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16078521e4fede---kopelalojeromenodazula.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/piduzi.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/53229577996.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1b4152f0a47b34e6174a6f9b15ec368e/fadiwurakabopolanaru.pdf
    • http://barcabianca.eu/upload/file/rexivovetuw.pdf
    • https://akbaturgame.com/calisma2/files/uploads/85484944716.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2t0ig7ff21tdb65dklkmies414/52880881746.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/87c9b3dde51c78fd49039d9f0af29069/95028928801.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/vlb0aa5l8qqvkqi95nujvhe0l4/99788927346.pdf
    • https://searchlink.org/userfiles//file/79365257454.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e5abb0271---vitegotokelifozadimu.pdf
    • http://j1medical.com/uploaded/file/73126457398.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/3223275914.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8641b6037092a86714caebdb17521582/14748714447.pdf
    • http://sixtyguildersresearch.com/admin/photos/file/19820133492.pdf
    • https://fnb-concepts.com/images/uploads/files/91161182388.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccae7ea95d---posewulepakodizet.pdf
    • http://studiozammuner.eu/userfiles/files/xozirelukakafesilutukuk.pdf
    • http://portalkucharski.pl/app/webroot/media/files/35879606389.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ea3ccf29d4224344873ab1385310c715/65423135872.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51859ca62e---82401013887.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=42+pounds+in+kg
    • 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_off0001037b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 16792 bytes
font_01_sfnt_off00011b8d.bin
b2ba178fb6d0d333ac18b4f0a5ec124a4fa8abf25007c5cfa7f89d5fa9f0673c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 17256 bytes
font_02_sfnt_off0001487e.bin
efe516b2db79cd700d606232c0b1b5ed030fa64b7f3a5ae1e46b9446378ffca1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1487E 10320 bytes