Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc55d367cb4aab20…

MALICIOUS

PDF

79.9 KB Created: 2021-10-06 06:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cbfac045260b5af594496a67422213f8 SHA-1: a9f5cd54b3737a71c99fcc0ad72a9a36792dae85 SHA-256: cc55d367cb4aab206b91c3e33d3fa177cd069f88ad654457861bc2f711512e9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=export+cd+to+mp3 PDF link annotation
    • http://0851gay.org/userfiles/202110file/2021100502253170554.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/puvaw.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/baxamu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb0121322---xokuwikitejefifaba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425d509559e---papakibitapenepiluvu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6183e038e3d15d3946c618300c048d65/refasuvixusan.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/15467453584.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/xudivuxoludo.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/takib.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/1759935005.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/16658281838.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/24574818609.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1632480786.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/82927954821.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/rakudunawuj.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109301014595727.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/puvebexowupamifib.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/93220375915.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e56502dbd614ed0d96f65d8d51c3ca3d/70645928151.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/82768055723.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/dumovavapemitoviwonalaxof.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/monabarapusuvazuxorokugak.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/kiduxagaxu.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_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 17832 bytes
SHA-256: f8e991cb8a0134242e4de71b9c1131dfd09c19fc1c18440c596314f9e21497fd
font_01_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 10228 bytes
SHA-256: 83626bfcb935d20f9659371ad60ed6e88c3d294f5bb0bb7d285e0eb42fce7e20
font_02_sfnt_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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