Malicious PDF — malware analysis report

Static analysis result for SHA-256 3743e9252be1bd04…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 20:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2e5b3b8dfa0a958d903c3ba1d464a2d1 SHA-1: ecb6788e7ca566bacaf5f2b348a9877e1279214d SHA-256: 3743e9252be1bd04648bf0a261d815e8eb380e71e5ba226ab44bf8718ae3490f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple disposable hosting sites, many of which host other PDF files, suggesting a coordinated effort to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aumnat2car.com/ckfinder/core/connector/php/upload/files/95073612936.pdf In PDF document text
    • http://reclameindex.nl/images/uploads/91471748977.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/towufe.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/bupojunaxovufamodenusinel.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/47349007754.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311f401bf73---jadomibonubekidigomala.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/jirovel.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/99500371920.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/67b3a78f154a5b31da20e6e546fc58c5/pabemonasarafum.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/40729604386.pdfIn PDF document text
    • https://adikmanis.com/contents/files/12889733284.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/bokikabadalobe.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/dotenilakedi.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/kewiwizafuduxa.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/nowuj.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/rosenukimidexegodijexuzuz.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091105021073499.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/95923155198.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/gedujozusatazowazeka.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/78543624989.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/75735126083.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/79545225241.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/46824040323.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5abd68e46---fajowulaferaregavoz.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/72786930086.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/nokerurezix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dino+battle+game+downloadPDF 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_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 10548 bytes
SHA-256: 7b29bd17aee369d4631fcc88595e16d736f6a238b4255b3339049846694354ed
font_02_sfnt_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 17904 bytes
SHA-256: d45161c9beabc5c8c575514e8e5e1e731a9da260427f7823a8d8e3246278a7a4

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