Malicious PDF — malware analysis report

Static analysis result for SHA-256 1311fb9c1366b484…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 18:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4252607237682d6199b0ec03429bd353 SHA-1: adb27dc48dfe7aca8546a424f5bff9ee1abdecc7 SHA-256: 1311fb9c1366b4849b8e4d006daa4e159b6a779bdf70ed68f90d833fb89606f2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to bypass initial security scans. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=the+martian+stream+full+movie
    • http://espokebar.com/uploads/files/wexomumizudalulekubaf.pdf
    • http://prota.ru/upload/files/71593923128.pdf
    • http://napiarsaigh.com/images/xujawi.pdf
    • https://farmacieitaliane.com/documenti/file/bedisumekejelu.pdf
    • http://lpxs168.com/filespath/files/20210901221430.pdf
    • http://aapltd.net/userfiles/file/dovijufigamaxasevajar.pdf
    • http://bakoca.hu/files/file/gabosujoraluname.pdf
    • http://uralinteh.com/uploads/files/vebigupudolaz.pdf
    • https://siangyun.com/upfiles/editor/files/namenamuxikazidiweradive.pdf
    • http://www.pics4us.de/userfiles/file/5759352541.pdf
    • http://soluzionebenessere.eu/userfiles/files/94053377145.pdf
    • http://newabel.com/ckfinder/userfiles/files/47414873351.pdf
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/jezotaziwalirebiwelese.pdf
    • http://huynhgiabaohotel.com/uploads/FCK/file/41582918721.pdf
    • http://sualpturizm.com/userfiles/file/38622410998.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/fbe031cce6c448e9f561e9b1fbfc8c30/pemalase.pdf
    • http://sl-light.ru/design/img/upload/file/bawopudixig.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613164a68abe6---nebejixokitefoze.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434045466e3---79942590107.pdf
    • http://dulichgiahy.com/upload/file/81332785082.pdf
    • http://fujavietnam.com/images/Download/mitadewo.pdf
    • https://clubelsendero.com/img_pag/file/murazakajigeripek.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d606.bin
043ebdc2936627cd8d8ed9510635a7c1d404e0c128d5cea795d56fb16fbf9b5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 17576 bytes
font_01_sfnt_off00010356.bin
aa62c8b15238c1f9337479304976d89748911c6adf547599b13690e6eb1ac1aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 10608 bytes
font_02_sfnt_off00011b6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6B 16792 bytes

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