Malicious PDF — malware analysis report

Static analysis result for SHA-256 8466705762681c56…

MALICIOUS

PDF

90.6 KB Created: 2021-07-02 05:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 983a6963c0fd096abdb13183942507e7 SHA-1: e5c53ba300cf373e426d2480711af19436103c11 SHA-256: 8466705762681c567c139e2f3219b95b04a990e82d88f1045737028a83867c44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns suggest it's designed to redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61f06abed0---35968760658.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160becfe623ad0---25488406576.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3f8595811---sukedeke.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65209666651.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/5125825454.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6c6e3f82---xotenazajiwimikokowukik.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99e35a16c8---38444718227.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d82117340d95c67b1e9aed193762ce8b/dupenojifakebaj.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c3d9f9e53e11e8ae85f4c11c7e6ca433/31322936036.pdf
    • https://arichaindia.com/userfiles/file/29894400555.pdf
    • http://maciejabramowicz.pl/upload/files/file/lapagaleriw.pdf
    • http://corporacionnoa.com/UserFiles/file/ravolaxetuzenatusate.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ss5u7o3vaf2icbmu22dg0sgf1/kenikizowefo.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/p7th7rcf1ppv85s2bmk0lhi0nr/54877868527.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d445b88f---22859370504.pdf
    • http://hollywoodterrace.org/clients/863344/File/18092820772.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/xemonofewulutexada.pdf
    • http://abwingssuffolk2.com/uploads/files/30641499998.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a15f31e9d---7037881767.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ilid3hp7v5sv85rfklfei22js2/lagewa.pdf
    • https://tolgyesvolgy.hu/userfiles/file/69037920516.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/db2tba93tqnqv7n6681pa0silj/sanatataku.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c19272b378a---rupinamedefokovevewununo.pdf
    • http://koreanhotpot.com/uploads/files/rinaralelifa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=employment+contract+non+renewal+letter+from+employee+to+employer
    • 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_off0000fcd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD1 16792 bytes
font_01_sfnt_off000114e8.bin
70dccee97db82014cf3db0786fac1938313a3e6b16af2b0406b0b027ce4830b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 10564 bytes
font_02_sfnt_off00012d10.bin
163d5800a56807d96b63a428e2771f594c5abf0c471b770974c9eee8660b750a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D10 17356 bytes