Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad2486b84462c5d…

MALICIOUS

PDF

70.9 KB Created: 2021-06-25 14:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7603b06971a2dabd4a7733302a59a1ad SHA-1: f97459b00f6e2bf54d5fab9f40efbdfa8152cafc SHA-256: bad2486b84462c5d55d0300ebefb4f8ad74616c721465ac9d78308907a583672
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

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://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160865137d1ed7---38952340503.pdf
    • http://abogadosaguilar.com/ckfinder/userfiles/files/pokimazojenunizoxevi.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7446f0b2d9---45549184464.pdf
    • http://cmtsport.com/pliki/vevudutiruwakipir.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089e32034680---77031971451.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/seq56cmkdi30ckhup89r240oeo/ludefuzogipimuvafutazif.pdf
    • http://baigeleather.com/userfiles/file/fomajixobozabixew.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7fdc9648---99970159305.pdf
    • https://kidneystonetreatment.in/userfiles/files/7683557275.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c479feed7a4---getekasomumej.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f305e2df4f---21797813648.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf191e585fb---getorotegafabuxetal.pdf
    • http://alituncer.com/userfiles/file/ketijusivoboguluvanuwo.pdf
    • http://helder-effect.nl/userfiles/file/piwanowadolasuwomosiritaj.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778ddc14299---29868324080.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=night+kiss+images
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b737.bin
2439cc07af22ca0343a0aede056ef4a7245da2326e022a403edded7c560cefcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB737 10256 bytes
font_01_sfnt_off0000ce48.bin
387864e97bcd5ace04396aa1c06c509d42f3ef0d09a31267cebdb960db43d7cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE48 16164 bytes
font_02_sfnt_off0000f738.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 16792 bytes

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