Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af1df1a4dc998e7…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 16:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe9ace5279200e6da903095f9b2b8263 SHA-1: 66d049be1c7c9448ebbf372bc01afeb4ba33a9fe SHA-256: 6af1df1a4dc998e7326f62b5dcbda3d6c1dc0c091b30fb5f4c5d6bcfd6de660d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=what+are+five+general+properties+of+aqueous+bases
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/129otoigona19qahs0c2jtf786/39235034212.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/640883afc9e475cf9bad0c63dd527e5a/98912235572.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/58977c5782e973c4d3b1a5ebf46fe5be/vojonem.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb621e1dad---50068206953.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f560e7a8---67030223872.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c79936e03---sejagaxuvigutevevu.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9822131770---59931894653.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6d5a9d4519732e51a9189609fd48fc1b/25830819953.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e6eab75a---27307414990.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/88da73d3ee849d222bf66c4a69358817/51336755336.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/1e10a833b1a91a99b3ce8cea53fca0bb/62091179052.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/93837224653.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49d171e0d---79359137017.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee65c3645---90343864521.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50594942b8---pomuf.pdf
    • http://shinies.ru/img/lib/file/90185842039.pdf
    • https://mudraconsultancy.com/uploads/files/85481848297.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/88420014901.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607385ab0e22b---62481016274.pdf
    • http://www.dereformasenalicante.com/archivos/files/93586560164.pdf
    • http://lagunaapartman.hu/images/user/file/12621609264.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b71013060e6---desajiretumudatusikof.pdf
    • https://hsse.cl/files/89060878354.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e1c4ea6a---14779857275.pdf
    • http://hasyo.net/files/file/tazebejogubademelabosivo.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/68b27c42cd3e10be2f2fe5e2b0e62a6f/72745352283.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_off0000edb9.bin
375a7d68cd53f7dc3c7a3a7ba55d4455d972d877acaa9b9aa7ccaf9c0896420c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 16992 bytes
font_01_sfnt_off00011a2c.bin
89e3663b207e900b2ab73715ad1b326d3193e3fb0ee29c9f517ed7037fb6708d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 11084 bytes
font_02_sfnt_off00013372.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13372 16792 bytes