Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebf80301209d982…

MALICIOUS

PDF

87.4 KB Created: 2021-06-25 22:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1a01e2c5b9007cc1ff017de70e117ffc SHA-1: 17aa6c0e8ce7576bcce787f056642968ef7fa6c1 SHA-256: 5ebf80301209d982eb896a465cf869de73ad78edb64b01f08acbf9026189e6b1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/efj1h2pe2f60evffhjvgh4nc05/panugero.pdf In PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ca6b4825---94817461607.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/sanowuduganedab.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/wotoj.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0107d4bf---20163809210.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/24945545807.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/pubuw.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d5edcdb2---76050599181.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/nowifolenokesevukemibisug.pdfIn PDF document text
    • http://deauville.ru/files/file/wodudopimelufezun.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ac770e642---zolipazenidejib.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/simovuzow.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8683c04c5---debugujo.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/32880346030.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/vetifadagejepi.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/26357238144.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/1e5ccc60ff5b56cfdcf432e56370b625/1833941439.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/vinajafime.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160865c9d3766c---99198900038.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b3d47fc76---koluz.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608be2b06d56d---78523658069.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19a17321cb---11308404355.pdfIn PDF document text
    • http://esistore.be/userfiles/file/vuxede.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0pvpccheal9s4cmqc9ulvd5e21/tudogubidusege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=different+kind+of+skin+rashesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 17560 bytes
SHA-256: fd07d40adcf863eab628ddc1f8c07794bddd24b8d4e25b505c0a91c93422229e
font_01_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 10496 bytes
SHA-256: 16a7102e37b47fad1f5b7556c7a30fb372d44f2e07199e138581fb31fafed839
font_02_sfnt_off0001384c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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