Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcd83584476f32c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 12:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7db18b7f6eceede0cb305d4bb7a6d354 SHA-1: a026c6dc30ca967af4f9fd9a8aff31301dde1f35 SHA-256: 0fcd83584476f32cbfdbc0b24582790ea0e8e2ad3d9534fffd260797d58b8f9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress uploads and other disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://kabelkyaobuv.sk/editor_uploads/files/kozegolosegak.pdf In PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/01mvfh1md1mf08r9q9lso7emna/32198545779.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/rumedibokezo.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021053011380973499.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/60156801351.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/rudusizikivotevobu.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/81370703461.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/gibis.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/fobawi.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/96029055482.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/32953663337.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/39c74ad8b558d64490ba9e233692cbe1/gizakipafi.pdfIn PDF document text
    • https://strechybenesov.cz/content/25980462374.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8c5c9abd4---30191058305.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/mofosegodok.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608068d784360---pazutiwowomew.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/kd1a98mc4vfktnd4qmlebbvon4/keleborivazinegur.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/23188999763.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16089c53d8f384---resela.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/bolagibosuno.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/sifukifusojibi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985f14a087f---vovukakolimelijaw.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ba801139f---visokegakiwuresuvegu.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/76561881453.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e333b9886c---wulipuruvafixalumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=contraste+iodado+pdfPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/gesapafebefixu.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_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 19948 bytes
SHA-256: 5112aca66bfcbfef13fdc4c92d2eb2fc1e73f31bbc93e21efbcf0482a551a33a
font_01_sfnt_off000114f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0A 10476 bytes
SHA-256: d474af10b5054c1fa890ebbe9cebb2af9c6b2d18c9a7d09a97efae8fbc69bef9

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