Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afae4fc854169e9…

MALICIOUS

PDF

72.3 KB Created: 2021-10-03 04:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9e61f7c8d3487af5178654ae402d73e6 SHA-1: 032664f27b97b05c18069b76efff148457f78f34 SHA-256: 0afae4fc854169e9b4931e9e7ea21e8f4a42f1d733a5ab17c965968d17743370
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of external URI links and the overall structure indicate an attempt to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=most+common+plastic+surgery PDF link annotation
    • https://www.studioline.ie/ckfinder/userfiles/files/85193756835.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab07a2a43f---26802492274.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/4643d3976839f05271b7f2ddc7b2f32a/96582626767.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/86377648505.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b8417078f---70477374948.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f819791ca8---99957165346.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/zafojure.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/54643334169.pdfIn PDF document text
    • http://liyangah.com/Upload/file/10116197148.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/jeneridamezifubopaweb.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d507c9f4c---54695299007.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210908_875FB6193378DE40.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210906180251.pdfIn PDF document text
    • https://cubic.is/userfiles/file/zizepixogekodobogug.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/gopakipajomixijakiw.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/miguzelaf.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mjed95nt1oooqdm94i9256pm52/52499980554.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/47725594724.pdfIn PDF document text
    • http://guowangcable.com/d/files/55605033678.pdfIn PDF document text
    • https://pmms-online.com/assets/file/30858945318.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/19220167696.pdfIn PDF document text
    • http://infypos.cncmonitors.com/infyposcms/media/53804633055.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/rewojefagikosadepujimi.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_off0000b54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 10924 bytes
SHA-256: 0874d4b17109be8861043072689a4e9cfa448c897b1685352e3af5373c02e20e
font_02_sfnt_off0000e6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BB 17744 bytes
SHA-256: 4214242bd3e5968ade126da6081303377b1958446376753f910027603de83014

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