Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a9aa4895a507e0…

MALICIOUS

PDF

87.0 KB Created: 2021-07-27 01:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b25c6dbcc54c7a7537f5391448fe766 SHA-1: fe4f0972eea10a8325232b39c8d8e6960e596e8a SHA-256: e3a9aa4895a507e0bf1094c77bcd9cf396d0ccb6ae3314bffb4af4d433ae5a70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware delivery. The presence of embedded URLs and link farms suggests an attempt to redirect users to malicious content, likely disguised as legitimate downloads or tutorials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://penney1970.com/clients/7/74/747debde904cce1d9d58e62e9103e361/File/53155835188.pdf In PDF document text
    • http://basaritarim.net/admin/editor_resim/file/lizugavevel.pdfIn PDF document text
    • http://debden.org/userfiles/file/xofivalexawogez.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160de87328de08---foluwafenedariwenixube.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/runixewo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d171e2d1---78604828730.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/96728490897.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/nuzeloxituwigurur.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/sigozi.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/movajoxiwotonanuvatufus.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/tugibopuranuwami.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f67c70641315dd947b6404904897232c/tetijugazikifeg.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d777e0b9---51850822462.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5836851881---watoxuzitukikikegukomuv.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/1f547d3ccfc8e96aee6a452a84e3f08d/vufexoxawatujonem.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/250725418755.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/pinulujumiwoximegut.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/lsh5l8450tkhtkmn5t80tju0cq/ximegubopinedisor.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/58474d9e494c6fa2458bdc9a8deb6d06/gomoketurif.pdfIn PDF document text
    • http://ahchala.com/img/file/pinibirexugosomusigiwodus.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/a0cahjaguo0ljmlh75an11ahv1/81349380445.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/02375g44tsmjcqhon8ns3keoh8/96700157262.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/d15b1fca551672b9662db2528eaf33a3/32251171355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=microsoft+excel+tutorial+point+pdfPDF 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_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 10808 bytes
SHA-256: 245034df4695faf4efcab9aa84bceec6e3d7e745501ccd859ceabf0012e42827
font_02_sfnt_off0001248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 16088 bytes
SHA-256: 7e557eea94802b73d53f5327ab49984708d5cae2bc94f3480be7e07dae9aa773

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