Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f98fa2262da145…

MALICIOUS

PDF

90.6 KB Created: 2021-08-08 22:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5f62c2f10528bdec2d425088cc35006 SHA-1: 95c7141868810646e1ab796fe41c642649125eff SHA-256: 13f98fa2262da145ed2420ab689e94b753a53006c8496b3595de3941b76c5320
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=how+much+does+it+cost+to+renovate+a+house+in+malaysia PDF link annotation
    • http://classicalgardenstatues.com/uplds/file/82593875754.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210807010145.pdfIn PDF document text
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/kobeneroko.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/54682f77bd80a47a343c458c4b0b4c86/luguvonarexalalekorolovis.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/uua6kas8u8vmgtuqvotnuhphid/38170703383.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/83340225312.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0836810b---97329834753.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/37349909779.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/18490152827.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/37022741776.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e72fc6a0fe58c992a5f0ac7defe067c9/77789678475.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e773388eed7---budaxasukemazuter.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d199a5e1e---jekatoxawopabot.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/43015479332.pdfIn PDF document text
    • http://trevorhannant.com/59994047793.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d7f4bd87e---zolelatize.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e0ddca96998c3e8807a124299560f485/tigepetufifuvijaserijede.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/busoponupazukinuke.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086d4f9cf36f---sapigufifawibuxoxek.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/22477885879.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/s4dkh2q30avggoch6hdt00n0vp/kuvidopunidepax.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/3170c1a4911581b71816601a7db6bc8d/74842114641.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/kikotivilebarefo.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/wimonogam.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_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C7 16644 bytes
SHA-256: fee97ea0e813663ba574615ba16c3b3c4aecc128bb2bf7a2cf2f50346d1ed109
font_02_sfnt_off00014217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14217 10992 bytes
SHA-256: c23741e78631851254781bbf4c255eddd5c7203f81988b3116951b917981acb8

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