Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7d7979b95cbfb1…

MALICIOUS

PDF

78.5 KB Created: 2021-09-14 22:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa746835714c33767abc9087b18db889 SHA-1: d47acf9b84c4ab3f6ae9c18ceec43761db5eb16c SHA-256: fd7d7979b95cbfb134ff54c9166d05deb121ffbe0e2318da0a53063fe40c8a4c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating a tactic to improve search engine ranking for malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krisoc.ru/uplcv?utm_term=temple+run+download+apk PDF link annotation
    • http://naitikfashions.com/ckfinder/userfiles/files/17675449559.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/83952945554.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/zuzokoroteropodojox.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/75338120967.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/kotebonuwof.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/20213638805.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/88414687034.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/welekotufabobowubu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/e4os3ccffiuabb7ojplldc99ni/jubusal.pdfIn PDF document text
    • https://insp.biz/img/file/88324063515.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/3705022558.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/bomidisusujed.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/lewabofakixotiso.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/26084576972.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/28103e36a17792f5695596c1ad4fa669/40854080069.pdfIn PDF document text
    • http://santabruna.cl/upload/file/53253126374.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/xegude.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/22922285847.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc9160eff---zogofazidatap.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/84876996983.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d84453d94ef4051ec15ae526384e85c7/31714564806.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/47957415132.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_off0000d01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 17564 bytes
SHA-256: ef362cc8a4126e779f9d838435854b95b5209f8e2827597f0ea16a8e4e703379
font_01_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 10436 bytes
SHA-256: 4bfec9cf574315b69ff9f935ed1a1e29dc4fccd4e6fba689c08bbd02bdb169da

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