Malicious PDF — malware analysis report

Static analysis result for SHA-256 24657a7517cda545…

MALICIOUS

PDF

72.8 KB Created: 2021-09-02 06:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55f9ae6b159bdb0ded88684f30ad8de0 SHA-1: a31a784065ba7e14f598c32954b16c8df6ddcaf9 SHA-256: 24657a7517cda5451c497dc650ef5cd0f10b7e2ae4c9d800b719bbeb99e836a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated high maliciousness. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c101767b1ce---11299194035.pdf In PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/nizovob.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2946c7a1f3b67772770adb8fd21b660e/96428186811.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4123528a0ebdac954071d2eb89a36331/wipinanakirakemuxo.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/98143870083.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b40ce99ac---55471099267.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/85953674116.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bakijun.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/54440305499.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160703f78c813a---74666836500.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcaa3dc1c5e---4094062479.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/vonewuxibuxifawumirufa.pdfIn PDF document text
    • http://normel.org/files/upload/file/16849197903.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/dexegubudirawufudibiju.pdfIn PDF document text
    • http://labsshop.com/d/files/fifirumujaperuvake.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/46253921655.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/rifedasifujoni.pdfIn PDF document text
    • https://areicon.com/images/file/binuvaperajil.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c2b8ddc8776fb144f8690ce78f54681f/ludexilosekefexo.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3204ea73b8f856e378c79a5bafb6ab12/zunisarisejileb.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ea85b433e---xiwekapitovokabuzim.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/molobozamolobojafa.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609017b5008dd---masatik.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/017eb69d3f374d18a3e512b6f3817711/37700817442.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/xotefewut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=do+you+have+to+mix+acrylic+paint+with+anythingPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/15211849471.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_off0000bd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD29 11120 bytes
SHA-256: 0e83ed9f8ae4c476bb0ba1b76d3e52867b652c3d42ff8dabd96edce9ffe419b2
font_01_sfnt_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 15156 bytes
SHA-256: 21c1b7046a6b2cfcb1a549a8c0334ebe710817931ae339c147ff720c0db52bce
font_02_sfnt_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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