Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3ca5cf679ed338…

MALICIOUS

PDF

80.3 KB Created: 2021-10-06 18:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 458db79a0c57034b6ae58bc2b804d63a SHA-1: c912d1875f8e61bb64497956ce49705f80490775 SHA-256: 5e3ca5cf679ed3388bf22d29f65c3effbf5c8250750dce43b9c9125655953d51
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. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to drive traffic to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=cathedral+church+goods PDF link annotation
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/36133021214.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/weromofit.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/77126341241.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/33243144181.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/89555247346.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/wekevi.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/35189726807.pdfIn PDF document text
    • http://imi.vc/upload/files/39353807177.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/tafuwukerajumafumorediwe.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/bujute.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/fudiragabo.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a967a6b24e---vivufakazevepajed.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/31343962977.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ae38dee1997be25725f6d33495081ec3/sulunup.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/nikavaniti.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/dutifiwujixoxakenoso.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/diwifinogelav.pdfIn PDF document text
    • http://julianina.dk/upload/file/63379794426.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/6665305362.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/428889605.pdfIn PDF document text
    • http://schubert-hh.de/image/file/leduzuxikejaxapinuweku.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/79383789878.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/d25789f92ff7658d50d885ebdd644d43/97507175489.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109261035587254.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_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 10584 bytes
SHA-256: 142b2bfb9d7684771e2a6d904b5e8da82304aa525034cb3a7605411aa80aebdd
font_02_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 18532 bytes
SHA-256: 63dd1c6422f0437ea3043e1a5ea870fe79082ab7f9c37c11efbbc0d308103ffe