Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd21c549d9165c5…

MALICIOUS

PDF

94.0 KB Created: 2021-07-31 21:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d2a5e5cbb61c6165ecd4277d7baa0fc0 SHA-1: 6d70fbe445aa5c836ebe8afa46aec273be64dcf3 SHA-256: 9bd21c549d9165c5e1938171f275d9c07dbb44e96cbd950185e18cb37faa512d
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 high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or suspicious websites, likely for phishing or malware distribution. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3683533230985baad7ce1c3239fbf615/povijusawesowedejisap.pdf In PDF document text
    • http://eska-lift.ru/userfiles/file/gesopemebijesig.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/13439375596.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/82948486538.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/74606595331.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/popekit.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/62372259108.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160baaf17525c4---82298768169.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6fc3ab57b---nufediki.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/janasoporuvixisolodat.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bbffe352845---16459384597.pdfIn PDF document text
    • https://wecareprogram.org/images/file/jukofuv.pdfIn PDF document text
    • http://islandpointfl.com/userimages/lapuvekarevupagawu.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/52295274134.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869d6ff0f85---lezudujosariwotobifuto.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/32d200d61e05a259b5d2f021c7be8ef5/selus.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/dde416fec75e9d84a4bf23a6ab1d0430/34301936101.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/vedefowegavedoto.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/zurasikifaduzoje.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/61174379188.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/takusuvureroze.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4ffca497---16175930955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mappa+metropolitana+di+amsterdamPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 10544 bytes
SHA-256: 0538e204d0bdd8261fb0241d6ae009bee71f9ecb219fb4ede234e2155deccc4a
font_01_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00012137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 18428 bytes
SHA-256: 6d331a4e530d29d821ada6c0e0f032d462b3fa766be109e578777509f8f9b992
font_03_sfnt_off00014fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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