Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f334d5360c1e5a…

MALICIOUS

PDF

76.2 KB Created: 2021-06-29 00:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 20da4b9e6e57156c0e3f6d682b08ccb9 SHA-1: ef5cf91c53ab3b1aacfe7bb16ee403adab266c95 SHA-256: 04f334d5360c1e5a20473009f5f2bcbc06307f61db2d3bffd3d68a7cfa3160b2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vareritigi.pdf In PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e43715a62---pilel.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/suec0bnv6fvd74htbddc6u1cb3/buburawodafamixibin.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b22f456993a977118ad82315c3ce8a3d/31532780187.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2b0b73248---11931599130.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/vugovo.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/bdia399kt4483mpmegrr7l626j/93689291598.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/85780247592.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3ce04c368---12390934329.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/hkusstdbm4nc6rg9eh8u36vl16/99260833610.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090109d09b76---83031393603.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/85655744895.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052323552767.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/1bb3492174579c938bd457a0ba492860/diribajiniwotitisidawetu.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/pokqpfoabr6745617581mr05ck/52936298998.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b855829f7bb---89952597465.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2fc09d63ce9c54c5a31e0be881e1119b/3198580935.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/rcupcki3b3e4cn0a13ne3mtf82/tegeduvavamamorerusu.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d9a005d1c4a1e047e1e56c0e33229ebf/debona.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078c2428c512---jiviravisepubipi.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609173d800cf8---66336431568.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/addi9uhu9he2chbrsvlim60upr/kogoboxikiboniravadadage.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/b1820c1f585f209b00fa7d35d1ba6fc5/7231418142.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/72826581507.pdfIn PDF document text
    • http://skncn.com/u/files/kenuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=intermediate+accounting+volume+1+valix+solution+manual+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BD 11228 bytes
SHA-256: 87a72f3ac7ca2ae90e481999b147174622d9f978f9f904af7904a594ac884ada
font_01_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 17196 bytes
SHA-256: 1c66d80e022803dc3a6e87f3ffb63244f7fae07e4cc0c1a71df3183db7217bcf
font_02_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1