Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde3480909480a21…

MALICIOUS

PDF

91.1 KB Created: 2021-07-03 04:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf2851a3b7676ffb366a8369c4465b96 SHA-1: 179edc0ffb7c85444ece7726a115196a4790f05b SHA-256: cde3480909480a21ef8daf45304a99d470eb5175eb97c6b8a070ad9f19a66eb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many embedded URLs pointing to compromised WordPress upload directories and disposable hosting. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d408ec519f---63987095876.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rf5ilse8e9fjd274jlhpk4t2a0/peruter.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/dbrbdkbfp0f06patc25v2o5ie3/922158573.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090db361acfe---72062965865.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bb4ad34f8e0a078f7611faa4a730efb4/94856697741.pdf
    • https://eyetracking.pl/userfiles/file/38589145553.pdf
    • http://flexicourse.cz/res/file/24384889768.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16080a77be625e---tadakib.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20c2dd2b6b---80056984298.pdf
    • http://christopherdallo.com/file/gugoranojogi.pdf
    • https://getadoc.in/ckfinder/userfiles/files/pifutet.pdf
    • https://universal4shipping.net/userfiles/file/6241925532.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecf5b8f533---53127441672.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/27362ff26b62e2b996a0da2daab2326e/65496496921.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ed6de69b812a2a4b1602ce57c65708f6/pakejoj.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0394a5f1---tiwubikad.pdf
    • http://navigator-nsk.ru/userfiles/file/dedunapawelolekuroki.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5371fa2c49c44e7fe1c308d57f8a985f/wawobatixemonidumesu.pdf
    • https://groupunsur1.com/contents//files/60373467421.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/afdafa330f90570d230e4fc7695e688c/dekamuzexupigurulala.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/9b1f2dbe150bff99115e059d157013a3/91786925339.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/9948eef7b1712a962c0f11cf859ffa45/pizibowipipurenagori.pdf
    • http://agcslohian.com/userfiles/file/51222520482.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/zujobepelu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=followers+and+likes+analyzer+for+instagram
    • 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_off0000e72e.bin
e4c853e5e6fb2757f951379db937a1e8f48ce06818edd0cb6f2efac4c80d0e92
pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 17464 bytes
font_01_sfnt_off0001156c.bin
ff36ff4741a0c2d2bd8246396c3bd3401b3c13f1fde4b53779fd186d5ffc956d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 11028 bytes
font_02_sfnt_off00012ef7.bin
cd72ad6735bfd53e30d2cec2af418edefa2783a0e61202871a16198042a8f879
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF7 16572 bytes
font_03_sfnt_off00014631.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14631 16792 bytes