Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cdd7246795d708…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 16:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab87d541965c1293a289f244188c48d2 SHA-1: 45a4aa0bb3ac7b973783d6a4231ab7967b0580fe SHA-256: 57cdd7246795d708a812ce0da6ab79ca60e90011a20cdfb27564ab432035a0e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The document body is unreadable, but the presence of many links suggests an attempt to direct users to external, malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://fantasymusic.it/userfiles/files/79103848198.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161340a9fe78af---pibotafimi.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/jetivuvofa.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c18904ab8---77494039180.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/mepojifa.pdfIn PDF document text
    • https://clinicscrm.com/img/files/gikiveba.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xifime.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/91220497787.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/81132331115.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/sofekakug.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613091127dbd0---demaselejil.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/62884069264.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/tuwetigijujoviwinutu.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/nosupapavejazakerofoxad.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301ce28e380---rakixijadaravozi.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/28458131936.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/87288548015.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/83586320703.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/devukuloneve.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/50492890240.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/sawuzujagodoluzemu.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/loranibinuzerolusedu.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/38195280989.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/80551915571.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ef41b7fd511f3a02092adcb917320686/toboxokosafovonus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=subway+surfers+mod+apk+android+oyun+clubPDF 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_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 11288 bytes
SHA-256: b998da6c2a73da2564507fc81c36cd3efab5cec518cb1936862c02353426e462
font_01_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 19624 bytes
SHA-256: d2d4e48d1217944f65f886c2d582b9769dd1559f3d9dfad94aa73966eaa08349

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