Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3908e9e5612019…

MALICIOUS

PDF

91.0 KB Created: 2021-07-19 16:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76bb8f37af5206ee19b0c7fe45426c17 SHA-1: d748d4eff4394b80d0a3b9e78dabaffa30fbbaba SHA-256: 5c3908e9e5612019a47a4072024caa47b0a27cc01259f127c4d23a034a277305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites and appear to be part of a link farm designed to attract traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious content, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6946aec848---sinesojune.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/436540b4db2f3c61c5ace2e78e6c8e52/xukajivisiramoromenutufu.pdf
    • https://ev-owners.jp/userfiles//files/31525500228.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/9t1b2o75rq3q3efjdnl2i5m1he/86618892119.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b92ed72a7b5---52806246226.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c2a3a5f2bea4ed2cc0aa1b7dab72e16f/mepemuzaju.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ffa82de4e---pikukunozudexupu.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c7aa264a---70520610901.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/nafeluzaxabelol.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7e66cc88c8efc364222e5ea9794fb4af/mijovofidelelisukeja.pdf
    • http://lionsmarsala.it/userfiles/files/90760033041.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078e30554902---nuvugig.pdf
    • http://gocreate.termall.pl/upload/fck/file/94910861018.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7533118d9---kodikotasal.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/60167194480.pdf
    • https://gyandeepjkss.org/userfiles/file/62450717404.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/b1c0e42ad6f8d6ca5d53fb9eddb15b5e/76171184450.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9993a4157---16343734357.pdf
    • https://hoakhanh.vn/uploads/image/files/83785453610.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c520db0856---79612035801.pdf
    • https://sieuthigo.vn/upload/ck/files/85588873504.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/b1f8fa845d795e8b626eb9ccb51b761b/5147068896.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ethical+hacking+ebooks+free+download+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_off00010190.bin
5143eaa21d0dedf9598823b40f4afa7ee80f27a1830cf6d0b9663c060c017265
pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 16804 bytes
font_01_sfnt_off00012cba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 16792 bytes
font_02_sfnt_off000144d1.bin
dae4a64e683e6b580fe2345fdb747c050783996cf1dcb91c63e2f61c5ce7be3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x144D1 11200 bytes