Malicious PDF — malware analysis report

Static analysis result for SHA-256 decbcc8d44b0fa4a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 10:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3b92a6c187c2283c9516a5f00ecd3a68 SHA-1: 009caeb3bfa5e900b04fbc7505ed458e14f401ba SHA-256: decbcc8d44b0fa4a4f3a14847fa8318d7deacf65174dff17753a3c79d2b89161
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://weingut-suppan.at/files/vewirizodedibewi.pdf In PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/50491700430.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/26i3l7ugkcqvpbp9f1f4mi46b7/winewijisuliza.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/1029125238.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233f1e8081c---bufikafevuliwixor.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160974ebabd159---wasazeki.pdfIn PDF document text
    • http://nakatka.com/files/file/37686317233.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/80659300673.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874a4a61117---pasavotinafofavir.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/3d442385345a485ae3d00a6b5c35ea52/74449016954.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/47335223388.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/dojebumumusawono.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/85460538917.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/dce9d1336d9d239963d0e3ac68830bf7/30336768069.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/gitafigexumofulejonamage.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/huhu54ldnfmsf5te914kspr6n4/xafarekoduvulokin.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210611232216002.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/39957834143.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/finosonuwiniwobas.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/10272593916.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b086fbee85---xoxoketafesivudowa.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/182f541d76101e9632ea7099addcb0d7/gabelilutugajukofosozusev.pdfIn PDF document text
    • http://signauction.net/userfiles/file/murotomugapirutomivekijas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hp+elitebook+8470p+user+manualPDF 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_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 11192 bytes
SHA-256: 879c0dbcd8dd39e519f87f0453beffebf40d8560921926901c18854cd8fe9f06
font_01_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 18424 bytes
SHA-256: 83b6db0f023831877e4a81a4ae9ab02d7f261ccc5631e97452ff8f64a7601b46
font_02_sfnt_off00012a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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