Malicious PDF — malware analysis report

Static analysis result for SHA-256 13edf143fee06b59…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 18:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dd2bc7051cc18f96735b51f5fc894131 SHA-1: d199747f4a0d74e88d3d1cd1c92ba31016bbeabe SHA-256: 13edf143fee06b597c2e5ba69e336e24820608048f7f975cf6a91b4ef1e65637
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF acts as a link farm to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://chcial.ru/uplcv?utm_term=download+gun+war PDF link annotation
    • https://bititechnika.com/uploads/file/28490297928.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210902_052131.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b989540febce0181b3539a963bd9b1aa/petasabogimavogijo.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090914275526.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/dekimumuw.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/9934653085.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/nagekoniwefufukipom.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/bexonojigikufafajiver.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/wuzulepowufifezisep.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef34b03162---54905601256.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/56868037067.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/53714463379.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/10839486071.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/48129676991.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/7483108979.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0174985a6---lozomasikuwededok.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/gefatudalopul.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/q8pdatfre4ut55tehboc0lqng7/84803663808.pdfIn PDF document text
    • http://lulanjina.net/upload/files/soxovobolibulanezizetozu.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/25214046611.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/29322013594.pdfIn PDF document text
    • http://8njl.com/userfiles/files/jafejemosem.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/54741158430.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf90312a9---zowokagufarusovufo.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/resezanigasilogun.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210906002539.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_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 10120 bytes
SHA-256: 69e3b9b3a913b0fe121cf26897a3512e1be4422168203029c442742bf9a891b6
font_02_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 18536 bytes
SHA-256: 1b591e39dde4d9d9c289cfe3fec33a6980049f4ef4917d00970e806e128d84f9

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