Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f94dc7f44537fec…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 04:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 75b2c9329d509e257f331e1d484292ca SHA-1: d66fb06144e44e7914c12cd451f01ad2b6151cb4 SHA-256: 8f94dc7f44537fec24162a6ea94c78c2e789049ab2c1bb21410b0f807e2540d8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely serve to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://sakaryakasaplarodasi.org/userfiles/file/sisogolafexerezid.pdf In PDF document text
    • http://hublihorse.com/uploads/userfiles/files/6663713165.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/8903160517.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/74d58e31ced997c0eec242094b8d1c7b/56177467193.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a0a96a38b2953d3d2136dba852f5a6b9/parimizifimozigawiwa.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c449ee274ac---11839335515.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/41085503116.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/87612212334.pdfIn PDF document text
    • https://birotex.rs/images/files/57312574878.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/pegodasafunavosu.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/22926791544.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca19d180b6---xibuni.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/300704364904.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/xalaxonirejuburum.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/babadopisabudinozuzig.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/59e6643d16ad1c80f76275af4f48fdee/25870385483.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/18c371b9be063b629a7fe0a8502a5a1e/bodusiruxasowaxilupesef.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa854640a6c---26662123664.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/betubumosuvimotajodiletan.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/7ef675a5136eb8edef03bb1d189eba6d/79012871994.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/89703806212.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/9mi9k19uj3mj25jfqe50cas53n/16621850422.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/zipidole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=can+i+call+you+answerPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/zibuvudu.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_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 18232 bytes
SHA-256: 6f22b9077d60dc66c3c9b354cb53987308bb41f70ffbeb98cad2c235e4db00fd
font_01_sfnt_off000117e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 10456 bytes
SHA-256: 7d4c0af326422df8f035ee9fe6a408c8aa2103e13257026366fe2d1bbc586fbf
font_02_sfnt_off00012fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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