Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9dfc0360ff6391…

MALICIOUS

PDF

73.6 KB Created: 2021-09-09 21:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 76e479878fcc6a836fc8d668cb662c6d SHA-1: 57e8f8e2606c350d34f68b7892ccae8fb529fd68 SHA-256: 9a9dfc0360ff639145e8f282b9c484bef295d2af4d66ff1a00bbda9448c48478
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting sites, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://coretry.ru/uplcv?utm_term=my+policeman+pdf+espa%C3%B1ol PDF link annotation
    • http://syekp.gr/sites/default/files/file/tenorogojowar.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/depigewimujigapikapuboler.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/78232891424.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/28592948983.pdfIn PDF document text
    • https://atlantidegattico.it/file/65950952789.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/54410743404.pdfIn PDF document text
    • https://denimder.org/resimler/files/rirazutugipadusa.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/85597340103.pdfIn PDF document text
    • http://poorclarescork.ie/images/tagubanulevi.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/31470268586.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613514d9ca461---rigurubepapi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1376c3861---buzoxepokimo.pdfIn PDF document text
    • http://timebymtm.com/upload/files/zovowudakimaweki.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/vefupobinolol.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/42516639055.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362eb8412f2---kafosabagivid.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/jumiduliputa.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_off0000b817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB817 18272 bytes
SHA-256: 35fa5d60902f2255292766208f5051e81461fd714382214d5f013e9f613283c8
font_01_sfnt_off0000e6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 10896 bytes
SHA-256: 134033253b644dd07a892bd178e72b8b4c95cb6af9451c2323b030b668c59a00
font_02_sfnt_off0000ffb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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