Malicious PDF — malware analysis report

Static analysis result for SHA-256 624fb4e8b2b0e998…

MALICIOUS

PDF

68.6 KB Created: 2021-09-17 22:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15ddca678f35227b85436fd01897b136 SHA-1: 15346a7cb7511199ece7502800954761b0ff6762 SHA-256: 624fb4e8b2b0e998128e7bbeb40ea68025d1b9c1ca01827bf00b406560e85dde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs and the overall structure suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aiwatopup.com/ckfinder/userfiles/files/raberikagotapebeligi.pdf In PDF document text
    • http://mylodge-naoshima.com/images/blog/file/42748912546.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/93696932970.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/65366937791.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/63088291420.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/41886370809.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/83571119138.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/11850829451.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/19176595974.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/11732754818.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/duguwojisobenuxenumujejir.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/ralusesowora.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f58321fcd0eb73dc9a7df6182e4e257d/tuvum.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/27290409432.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/75482131957.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/38945906210.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/jagewomutif.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/mepisa.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144a261d2176---gajasukofujati.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/59137972944.pdfIn PDF document text
    • https://znalac.com/userfiles/file/76301907968.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/magtr2n83hdjc9mvnur8v4hi96/tenuvovukaxawiguda.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e12b7c794---tixivanune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+download+from+youtube+to+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_off0000af6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6D 10764 bytes
SHA-256: 1f4bb0f35c3a9e261a6c015791f6a324ab5b3da29b40a69c45a1a3b829683feb
font_01_sfnt_off0000c830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC830 14632 bytes
SHA-256: b1f1bd49b9aa404466f1c287e6322b12d450fb657bcc8b479b2f4ca3f99686ed
font_02_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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