Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfee118df7921269…

MALICIOUS

PDF

80.8 KB Created: 2021-10-04 20:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 17787e43be325d62b63dea18e9469eb9 SHA-1: 494bfef07aba4fe95ae3a8a1be7039ba24694f1e SHA-256: dfee118df79212691e6ad07234b1d8f1de0a0f864ad1ce1a0664ac03a8c8e426
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pistant.ru/uplcv?utm_term=xps+convert+to+pdf+online PDF link annotation
    • http://praguetransfer.com/files/file/favemewupomiratobema.pdfIn PDF document text
    • https://angkagenap.com/contents/files/zipilisawolego.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161302d421f659---mikirewedukelaku.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc51765735---tupanufinejologegegoxi.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/12154492592.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/govijogososevunesaj.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b87c973249---37894706399.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/39622374068.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/momupogusipir.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/disikix.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/21c2a7a437176e144efec6cf015b4c5b/14628316244.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/fajaxem.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/62374778300.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/5199346527.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/defakatubonafimodawa.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/89627119547.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c5ce4a1dc---88953060216.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/fubabokuwopefoni.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/wududurezefel.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/36366351947.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/69016395991.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_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 10524 bytes
SHA-256: 04bc4f881dad371cc5c60f46631b812bad093a6cec6e5699937413e2d789be43
font_01_sfnt_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 17432 bytes
SHA-256: 3ff504524153ebb804c833c15271641225c7f26b8c829bb58e694245d48e7640
font_02_sfnt_off00011e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1