Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec499d75f4c28de…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 01:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d60282005660976a3b795e11ad65bbed SHA-1: f5540e2ad84df086a6d64fae35b72a1b69451eac SHA-256: 6ec499d75f4c28de61012284c85d4941e634054ae20e89eb0e6e877552bb15d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to lead users to compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://alemotta.com/resources/original/file/xofebatosevadipi.pdf In PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/92381107729.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/b0805c16a9afbdfa352aaf4f22b4137e/dumuwa.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/35590472239.pdfIn PDF document text
    • https://tomas-music.com/contents//files/79132687948.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160767d7f3cfcb---47613869480.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/vifipoxemevorit.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/926dd10010fecf01f79a9e542ab0f0c1/45133139953.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6a4849bbc---26219773935.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/70483531790.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608898e19963a---52564347251.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/70198676769.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec25d82ca---kagumegulaluxi.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/sq6cidlhutcc4f15kmkqvdlvmv/demuzo.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/53264562655.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/daxike.pdfIn PDF document text
    • https://italvaping.com/file/31875698414.pdfIn PDF document text
    • http://travellerisland.com/files/luxotebumotoko.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/41qb5phva0fucpq7bcjr6kl1du/1021558861.pdfIn PDF document text
    • https://fivetc.net/uploads/files/tinubikawanopigevimavi.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/64902987046.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/60422984998.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/40665850819.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/59434484656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hematuria+without+painPDF link annotation
    • https://medlineplus.gov/pain.htmlIn PDF document text
    • 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_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 10480 bytes
SHA-256: 1d20ed045dcf2b7453d2539167fd4ef057adb8db2b2bb70e17eb1addb7f270dc
font_01_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 15956 bytes
SHA-256: 78b83f481d42b72c531bbc4daf6768124fc7679bb8c2b7b69295177f6dadd955
font_02_sfnt_off000119e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1