Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c81a1f5c413702…

MALICIOUS

PDF

67.9 KB Created: 2021-09-30 13:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d9cee514e51d3a73efb7d8e7cb8dd7e SHA-1: 3197804d4cc68854b2d4fe047b93361ca1e2df85 SHA-256: a8c81a1f5c413702daa4aaccf6dc7e53606b7058002b28874efb2689d0a7c826
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable or compromised domains. The heuristics indicate this PDF is part of a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://nomylo.ru/uplcv?utm_term=inuyasha+manga+pdf PDF link annotation
    • https://adeptos.clevercloud.pt/images/items/files/devabad.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161497fd924605---rununu.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///15264561588.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/sirudogumi.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/18865013377.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/16549301546.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/bigadewonapexefurafu.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/45622396200.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/gamakikog.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/zefovulawu.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///robosiziwugisub.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161359019334a2---vafemudusaxazemapoza.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/jitigerej.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/negazarubesasudifer.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/25184174052.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/sejewatopirogobofedekulav.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/1419840296.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/rgeu4ofejm2899nddk9ednajiq/vifokiratur.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/xilodewijemonijej.pdfIn PDF document text
    • http://dakov.hu/_user/file/benakilef.pdfIn PDF document text
    • http://sakra.sk/storage/file/50783300640.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16152e46038c0b---wazexu.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/wamajagitunin.pdfIn PDF document text
    • 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_off0000af00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC717 10524 bytes
SHA-256: 66dbf92afbb5509267bfdd9a4a7dda7de1bf5161d86b504a28ff703c686cb3cd
font_02_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 14500 bytes
SHA-256: 4516429be4985a47ab21a532481f40e179ce698f955d375ec1ba10f2b78002d0

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