Malicious PDF — malware analysis report

Static analysis result for SHA-256 6085892b91c7e7f6…

MALICIOUS

PDF

76.1 KB Created: 2021-09-25 00:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e0104dab68a1421fcda34608c97bdfd SHA-1: d83adf3d3057fe6848a5fc106cedf07ae31db7d1 SHA-256: 6085892b91c7e7f64d330b74d57d97c7fd0cab7c227d3eb7662838faf4f11d50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=miracast+android+10
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144195bcf928---sagigogiduvukanobe.pdf
    • http://librojuridico.com/aym_images/files/kipegifuzalodizadadud.pdf
    • http://cdenito.net/userfiles/file/zujivabinajog.pdf
    • https://t2sc.me/userfiles/pibinumibafogepimu.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/baxos.pdf
    • http://engineersclasses4competition.com/files/others/12025730044.pdf
    • http://studiopetrilli.it/userfiles/files/pamojonivakut.pdf
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/mixotivekiretemiveva.pdf
    • http://jrpst.pl/userfiles/file/81153159082.pdf
    • https://noticky.net/akce/fotky/file/tiguw.pdf
    • http://uco-kampen.com/media/files/85109103339.pdf
    • https://bakwanudang.com/contents/files/nulilagagazigukebuki.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b40da2be95---9032656030.pdf
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/monabagu.pdf
    • http://abw10thstreetne.com/uploads/files/59030769040.pdf
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/rajiriteseguluxaga.pdf
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/zizaz.pdf
    • http://twilaw.com/files/files/sijodenuxebuwufuzopuf.pdf
    • http://www.asap-recruitment.net/upload/file/firafovu.pdf
    • http://josquin-capella.de/download/fedetedajujo.pdf
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/sezomosefufe.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424eebe4409---rudovutinawudanab.pdf
    • http://1yunnan.com/ckfinder/userfiles/files/sabevijebopuxajanagabani.pdf
    • http://onnetsolution.in/userfiles/file/vibiwurogiwa.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_off0000c250.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC250 16792 bytes
font_01_sfnt_off0000da62.bin
91be81e851c84146f35c30b9448feff2bb5f16a8506ae2af083ae93da98ea9d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 18776 bytes
font_02_sfnt_off00010b1e.bin
6ef90a4b7703ee8c65a2dc87cabfb1410dfaffd0e5df3fb0a9e5fbc5f28e35dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1E 10352 bytes

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