Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d0d837d596a9d3…

MALICIOUS

PDF

86.2 KB Created: 2021-06-25 22:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b44a0d06818287e5a76a8095c2f94f3 SHA-1: 3424f290cbfa1a9fb624719be974f5e47d8257ab SHA-256: 24d0d837d596a9d3424e5c7e8e215a16d34974d31938199e4707aece058a65c6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware. The embedded URLs suggest an attempt to direct users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c180161fa---57987607388.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e033f62af591787773644872bebc6ad0/40109609497.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b46aa2d48d---88980106117.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36961883af---29435995169.pdf
    • http://al-bandak.com/userfiles/file/moputez.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/d9f0fc4ddd26ffce1ef36adefbf901d5/80660804880.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/u85pobear2g6j954r8pbod0deh/39308989740.pdf
    • https://newtech-utm.pl/userfiles/file/15785501826.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c073731a58c---xatidosebukuloperidewiw.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/fdc63cbd8276c33a145563d000155571/21423646218.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/211fee036a31911f7cdf7777a1880860/fepabisoz.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e95d3924---24341869817.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57ed80c657---pigivisewitikux.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m8a9j61elpghdfbqrmb0elpbb7/fuzelivukep.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a5ab3f5c0---paxurizinisosira.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc681c8af1---88147509701.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d16f1456c1---rimofumunelur.pdf
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/xuledolifudorafezes.pdf
    • http://interno-kazan.ru/upload/files/42412138333.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c6052f35b5a6180688d278d04b5bb7a5/zemepa.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d25284982ca---tiluxibozizosezopubasiter.pdf
    • http://szyuangang.com/UserFiles/file///lefuko.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/04e59c1208a6bf38d8b4f3abb82ebaba/visiruguf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=stage+2+dementia
    • 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_off0000f218.bin
c6b0639a97ed2ba8e327d82ef0ee529d318623a07dd72bb8413e55a8d849dc74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 16464 bytes
font_01_sfnt_off00011cae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAE 16792 bytes
font_02_sfnt_off000134c5.bin
599b943518e1eeb1e50e5122ac083516f0ee8b2acd9c741a73a3d66c8b812bee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134C5 10352 bytes

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