Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b049f9675d5d8f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 03:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7eb2832878544b054e061652c8ccd61 SHA-1: aa1f16452108a464e5abebb84b85c97d19ce69d9 SHA-256: f6b049f9675d5d8f775d56188a8f67e7b2b55b2bbac44ee3e93123be4c0438bc
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, indicating a likely attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links to potentially compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://greenfuturevietnam.com/Upload/files/41673936505.pdf In PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/49353087302.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/28185738621.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/posuf.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/29326995850.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/64487339060.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/54688630015.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/gubabirilarawokakeja.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/60278015126.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/pozediwone.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/duvos.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131842b53fe1---25091735622.pdfIn PDF document text
    • http://space-edge.com/upload/files/88095459823.pdfIn PDF document text
    • https://birudongker.com/contents/files/feruzapixakewexifas.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/pexiruxutodi.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/36326827576.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/vugijeraxomo.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/nogotomakofewimabevuporo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139a3e0bf229---88028304594.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fk44uajb10ckodd2kqaj16kdn4/zosebage.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210911190131.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/46886435929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=offline+pokemon+games+for+androidPDF 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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 16768 bytes
SHA-256: 6244364fce6bb5cc228046be2bacb4b200db8db7b62dcd15b31060001f6e1ced
font_01_sfnt_off0001037d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 10860 bytes
SHA-256: 221c2198653523028cd8d7b1cccf507fe292d0655a2dcf2533a08b96755cf383
font_02_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1