Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c82861b5504020a…

MALICIOUS

PDF

68.7 KB Created: 2021-10-02 16:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c833ff5aa021dac0eb44d33387083dc1 SHA-1: 3faddc40e63a831aab42ee24bc764f9b2bf85b7d SHA-256: 1c82861b5504020a31cefbb0167f2f6e9201e9b4532f8b20a7fc3dfa61df5203
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to lure users to malicious or compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/87b3d88e1f9b63c00cd14e8130c3acd1/28081149342.pdf In PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/75093611698.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/25745209439.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/norutalojurobigomudoz.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/93557805618.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/bovitimupinexizes.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/20739380509.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/tusemagijowigidux.pdfIn PDF document text
    • http://lukinserv.hu/file/gejemive.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/68156539902.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161411059baef4---20327465116.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/gutidirejupiwoti.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/roxexamese.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/26117fdb943484f9fd2d3a3c8b310399/58134426507.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16157fcfdb23c6---zugadonuro.pdfIn PDF document text
    • http://terryloops.com/E/file/82182192948.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/82919647025.pdfIn PDF document text
    • https://webrobogo.hu/kepek/jomunozeviketume.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/nuwol.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210903085325.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/fozobow.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/netewoj.pdfIn PDF document text
    • http://abwva.com/uploads/files/64571519620.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/81763684440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+you+become+food+criticPDF link annotation
    • 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_off0000af6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6C 15048 bytes
SHA-256: cb1abd9fbacaffc7a34d10f723f16bd6b1d8a099c69764b97e08295419aa82c2
font_01_sfnt_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 10588 bytes
SHA-256: 84af11b752ccade6f1a3c49ccff3e5e72f155abbf614f18fd3262da9134e18cd
font_02_sfnt_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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