Malicious PDF — malware analysis report

Static analysis result for SHA-256 379717d73b923f69…

MALICIOUS

PDF

93.3 KB Created: 2021-06-26 17:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 889d443d572f1f6a6eb8903f0f662923 SHA-1: dcea8744b2cb9eadb868b0669e56ac38a9e5f6af SHA-256: 379717d73b923f69568788724135ee8d426cd9deefb1da9d60fdbbb749cdd1a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external links and the overall heuristic profile points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://cructi.ru/uplcv?utm_term=fruit+that+looks+like+chocolate+pudding
    • http://s-privod.ru/userfiles/file/kidawesawaz.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5ip541naf4e84brurui7vrt6oo/tawotebomewogu.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/46966522911.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/60b759166ce02f6b36896f69ac0e0126/fofetavukotalamifumu.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/972cc3c5fcf428823d12f1f6e960b771/matuburabuwekixoworupal.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/lmu2i5viqimkde25srei8l483p/38459091748.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/63dcbde363ace5c35d9765014f310918/vuxin.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/c4ec425d7b18981a0ae51cdbffea0f0d/68207239936.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/45d4506a806a6d3c44ee5f5e2d43e66a/zorijijomezagi.pdf
    • https://martensmgt.com/business_school/uploads/file/sasozebotefakijugege.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39de080f06---misemupik.pdf
    • http://eaas-journal.org/survey/userfiles/files/92103634711.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ad88f64306c---33123677771.pdf
    • http://cariboohose.com/userfiles/file/76028926264.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/aa771c2a95f333a014eadeac6a344591/rutepiritiwokuxizu.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/l6odkinajt8l5eihkpuilkn2c4/gujonopa.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9qklgfk2vs69vjt83tc5jt8kpk/64325488052.pdf
    • https://a2designbg.com/userfiles/file/vitebuvuzaligupe.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b90f9936aea---23959354759.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1k2lfgl0ubfqivcs7alo24e9r1/woxulutusojidamefo.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd6e53701b---wigezina.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160829fa1c19d3---57797265874.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a89109ebb1c59ab002abe2d2d9b70f8c/7740911263.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/xokalurutotewalenifepel.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f388.bin
b0cd4b5f6d2a371d1a9493f4caebdbb8a3d0aad86700185e29e2ba9a619b7ca9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 17248 bytes
font_01_sfnt_off00012093.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 16792 bytes
font_02_sfnt_off000138aa.bin
35a8fcb2683c01a17871c0bc1b564f94aedc46f881cd1ce6727461c5442f3aea
pdf-font-stream PDF embedded font (sfnt) at offset 0x138AA 10960 bytes
font_03_sfnt_off000151cc.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x151CC 16164 bytes