Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a24a5d7f71a4083…

MALICIOUS

PDF

81.2 KB Created: 2021-11-09 09:59:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 237712c229b0db407460a498d881e6cd SHA-1: 952b8330c4b1db6a11b9fb694aa1e3c91064b38a SHA-256: 6a24a5d7f71a408389274f6f3b840292f29a971fd0d62225b3084e1bfd482353
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://avandcie-automation.fr/ckfinder/userfiles/files/25074199382.pdf In PDF document text
    • https://vpmemorial.net/images/file/55748456185.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16153b0efaf300---toparefonifatewurepavakud.pdfIn PDF document text
    • http://pvvc.cz/files/koberewoworo.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/21443216802.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef400af0c5---87496503812.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/pomemebilus.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/2228598851.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16189ee7c4c2e0---11264344000.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f627dace32dd3dec3f6eb24d71a928ee/tozatepumomoliligan.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/217742102.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/70902274493.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/jevorurapaxilotej.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20211019045523_swrwoz.pdfIn PDF document text
    • http://qwerty.pl/_data/file/23396180510.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/wakivubomujurider.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/wubad.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/ponosomatujanubiwezedaxu.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/gizatifexifavavobevu.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/9781153465.pdfIn PDF document text
    • https://oasis-travel.ro/files/37158565319.pdfIn PDF document text
    • http://spharma.ua/files/file/vafomedijapotikenamejat.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=summary+meaning+in+malayalamPDF 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_off0000b597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB597 16280 bytes
SHA-256: d5143a67df8ed2068c6c55eb1957837a0d81871a7f568bbff0de1b3786f7d4b6
font_01_sfnt_off0000cbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC2 10352 bytes
SHA-256: 07d0339e51be83e64ff11ce0a2944383833419a2089758368c34f439a28abace
font_02_sfnt_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_03_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 23456 bytes
SHA-256: f3f50e77f8d5e6529ddb4a667686c0b972516b90eca8d206ffb37f130a219072

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