Malicious PDF — malware analysis report

Static analysis result for SHA-256 635c420703384296…

MALICIOUS

PDF

107.6 KB Created: 2021-09-06 14:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bad7d129fcaae1ae8248b012deb58259 SHA-1: 93774dc59f81965b4d34b8570f986d71767b1b46 SHA-256: 635c4207033842964c1bf4a23ba0726f27bb30b81eaedb92b7786b4728bed26c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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 https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9025392e---68297516312.pdf In PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/73d7ab991737fda95dbecb63f495bec5/29212641569.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1824eb7d90924a5e459e451cda22b21f/teporanape.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/58qbajlhv7bvavgg1cm0rf8jh7/15601200763.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/psa4fhvkof9ak8uh4uvvq4ese4/jakipubuvafoki.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/506836861.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/kazubuxurapuwegewelezaze.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/lozawomelefuzo.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/40942302187.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9912f36a2a---wujipa.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/9rg5715vr74t1v023luu75gc32/15009237105.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096978b0d26e---jutegopipikox.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/69i9q81klf2cjj4uo0r02oims9/52423527922.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/5285561259.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/wulabakimotufumotujizibuv.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/risagufisudifofipegis.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/70261569793.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160849ffc98645---tomukafotutimojedatovi.pdfIn PDF document text
    • http://grabnerestriche.at/18219365874.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0fadd00d0---tonazugojegure.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/7706309473.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de69cef0b75---vanuvulug.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f28276af8a3---50199291962.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/74180323812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=thomas+bernhard+beton+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12410 16152 bytes
SHA-256: 0f62411f33c11177563efe33ebd0105f37df2a55e6a92cd5aec3f2cc21bf3838
font_01_sfnt_off000139a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B5 22680 bytes
SHA-256: c2f6c7082f44d3a5da9a5ffb50eb7ca483ac3dd04dddd78589efc2dfbd4c6637
font_03_sfnt_off0001882b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1882B 10728 bytes
SHA-256: ced51e50f28898bbcbf71562047341ac3f34899f59ed04168e24219aa0e67ca9

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