Malicious PDF — malware analysis report

Static analysis result for SHA-256 9536181c58d2d4a0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 09:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89a0777e3066c1576f7f0679adce7a13 SHA-1: e0916ba240d15499dfe7685f8671a46dcb36ddd5 SHA-256: 9536181c58d2d4a0644f8a7bb6bc2bf542533da74a0d1f84f7fa41f1ba145a1b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=2014+dodge+dart+manual+transmission+removal PDF link annotation
    • http://fsoa.cn/userfiles/file/36872955501.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/21543607916.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b90437f64---babelodimaveka.pdfIn PDF document text
    • http://sadrainsurance.com/UploadedFiles/New/file/meroxesomajafo.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/6350365594.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/wifem.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160928d241f398---livetakunexowoneridi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/81bbfdddc9aae235d31a5c777736210a/78562611903.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/zitav.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/97884321486.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1e4cfd13---65465960761.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/movol.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/61f226057673d606b5c1050edff1e5a7/48126666294.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ah8cnb1j6u3lo0n5u83cnsom8s/74809854594.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ff734737a---ruworikesam.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/75279479901.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/406fcdb9acebeea6418281a67ccdb467/seniwajivavusosag.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/38126622895.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_off0000e362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 17172 bytes
SHA-256: 3cde0662a901ed7ea47bb33ef5054a5cd8096bf386448e5deaa6cf0bf837e6ad
font_02_sfnt_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 11032 bytes
SHA-256: e69764e10b986a5afa4ff35ef085c5b165916682928b77a942847c8c06786066