Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34f6ef877edce97…

MALICIOUS

PDF

83.9 KB Created: 2021-07-02 21:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 065f0227715092b74fdfb636eb5199b2 SHA-1: 98c36b34160e7e92cbe408b22ef5a3f94584d986 SHA-256: f34f6ef877edce97f21a516c0ccaa4e72dd63ce312441e07413af12b1d599a51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607edc6a8b06b---87157599581.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/963e0295ee171bf57f37282aa789d73e/kuxara.pdf
    • http://yasaitogo.com/uploads/files/64980918429.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7jbii59i053la6f88gfvhg3cj8/55358674983.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/febc67186ceb2c9f7980bbed6e785c01/tisusinu.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087659f72b0f---rorosokaxixisetotabufumot.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/c405p4of9c02jvekafhcgifgc2/ligiv.pdf
    • http://boeschfamilytravels.com/clients/43210/File/gunipotejebexugoke.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/jimowafijurorewimirofo.pdf
    • http://stlnsk.ru/uploads/file/putibalosu.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fcd8f2c1a---75827705023.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c31e175b4d7---78278938368.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b7b703663628745ce6d51a1fccc7964e/duwetesokasija.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f25372da15---429703180.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/uv4ig4of4hvuu7s6ki938sg32s/33285919481.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mdjf684m9p1utfrbd1vksj23et/lumevug.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bd708885d6f---56967761902.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/a159bae3aff3321a83801e37073d751c/tupedo.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ccaddcbe---zinokipag.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/hjnpgls4si5f3rgok0bgccrt66/zedejifumukedumij.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160703a95ddcf8---64759122528.pdf
    • http://cana.vn/uploads/userfiles/file/diruvavawivakuti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=icacls+remove+all+permissions
    • 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_off0000e233.bin
8389c9f8d3da33541568cd6455e2b2612e1e0dd545a004e0c8d32a340aaa15a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 18312 bytes
font_01_sfnt_off000112c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112C5 16792 bytes
font_02_sfnt_off00012adc.bin
7214c90865f74cdee453daabc8c1031fefd59ab08011bd104c535e82e1afa027
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 10452 bytes