Malicious PDF — malware analysis report

Static analysis result for SHA-256 727fab4f9c069cd1…

MALICIOUS

PDF

89.8 KB Created: 2021-09-01 22:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 26e4d7a1bdb7e9c387c73cdcba57526a SHA-1: bafff2eb8d9b782fa2f7fa891591530ea1d654e2 SHA-256: 727fab4f9c069cd1713ced6bad8b6ccd108e28c5f261e7b0fef2b88eaddee411
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The PDF structure and numerous external links are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=florida+drivers+handbook+study+questions+answers PDF link annotation
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e8d075036ea2e66fc53b985715ccbe15/93563863978.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/sipomezegebototanudep.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1090e39299.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/20458395592.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f60f0c58---mijuvanefakusumid.pdfIn PDF document text
    • https://mashura.co/userfiles/files/33874932930.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/74482161128.pdfIn PDF document text
    • http://digifast.cz/userfiles/fekikikikijuvusuriwev.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4411e0a311---vitom.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/hp4oc14blkgqtfas13g18fi8g1/jifiwimeradedowe.pdfIn PDF document text
    • https://okazionche.com/files/sotoweboretexexaduduwefus.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/tidonorororenufiripaxitaj.pdfIn PDF document text
    • https://maisonforville.be/documents/file/sapixebomoneduga.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd3e7b47ee---70532672148.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/pavugifetepozikagaw.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/wuwemenakixemotun.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/xisikibebakenavokan.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d5f9b8e7---lelorinapixutubu.pdfIn PDF document text
    • http://denge.aero/upload/files/27511808072.pdfIn PDF document text
    • http://ecotrans.vn/upload/userfiles/files/55684691721.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/kopugakedojimudilejobaf.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/446b46fb966189174a4182697eabcbf7/pokijabadetowisofefoga.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e9544f191620ba57b681d69a4c26184a/26149025933.pdfIn PDF document text
    • https://masukpt2.com/contents//files/88159825135.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a4e6cee6---60916565434.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_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 18084 bytes
SHA-256: 7bc153f8660a26e146620ecad440a8fce7f98cdaaafc66fa5d5a44acdd37f70b
font_02_sfnt_off00013f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6A 11064 bytes
SHA-256: ea7c98d599378b304889747917bf4d6b1f0e778958480e29ee74ca6576488bbc

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