Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa5949540d1a15f…

MALICIOUS

PDF

85.8 KB Created: 2021-07-18 02:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cf4f499e3304b3f91685812e81866fa SHA-1: 141f5bf6a99323baafe0b9025596f3eeae12315d SHA-256: 8fa5949540d1a15ffcaed4ec0c69ee7d009dea187d86437a5dc034d88006a42d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://eko-inwest.eu/upload/file/80561705602.pdf
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/89787866502.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2974fcf380c811c985ae6fbc82fc2d2d/75170272444.pdf
    • http://endemic-capital.ru/uploads/files/98653315828.pdf
    • http://gayaarchi.com/userfiles/file/20210615050724.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7fcd3e55c202054c3c67666eaf7c2ea4/52754545150.pdf
    • http://kuppersbusch-center.ru/uploads/files/17395148765.pdf
    • https://warungmimpishio.com/contents//files/naledatupuviwazexadepanag.pdf
    • https://htchninc.com/d/files/beranakejusasuriwomiti.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16078c932057ba---widebopitaxaratofowoweja.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/a5a29csfh3at4nbii4cja8nijp/vezuradataxi.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a81940113---53249990190.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806750b552a---86736454229.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8d84397053c37452854b3bee212c2324/13987887240.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce61cfde8---43291166460.pdf
    • https://africanresearchcenter.com/userfiles/file/fojogozekigawojusadukesa.pdf
    • http://forter.vn/hinhanh/file/ronufajava.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160813e932f262---10586577481.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816fe6e7515---28263076919.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6afb10c0---nevoseto.pdf
    • http://littlepearlbooks.in/data/eimages/file/femesiwigitokusigikis.pdf
    • https://xo-sound.ru/userfiles/file/89958100431.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5d9245623ec3542cca53ecda6a9053be/48960470749.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63d399ce0e---7759795861.pdf
    • http://peaceinsrilanka.lk/userfiles/file/sanawu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jesus+and+girl+with+teddy+bear
    • 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_off0000eaf6.bin
84f52b6636daacd39006fda269e966d6b189453ad4bcec61d4f619d405ed7e62
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 10840 bytes
font_01_sfnt_off000103c6.bin
ac4a6efb6ee81653050d6633cf9901acb54820004c5c0d76488b4bbeb14b513e
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 17124 bytes
font_02_sfnt_off00013021.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 16792 bytes