Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c6d91ce6815640…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 06:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d45ce3adcd1e063a6ab99776d82d0ff6 SHA-1: b3a6f6150f391a1cecfba4cdcd192605898fd9a3 SHA-256: d4c6d91ce68156404ae59e0bec974ec0de93fc7bbd672d140d6197f4a4abebb2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of multiple unknown URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://semut73.com/contents/files/poreninoxumebaraxap.pdf In PDF document text
    • http://kolbiko.com/images/uploads/file/vodubi.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03c06a670---jixosififurixoxutusanuzow.pdfIn PDF document text
    • https://questyme.com/userfiles/file/mumukigewimuket.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/15074441235.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/6590072663.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/94440629834.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/vakebuno.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/93681154188.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/posaxezabarodukikokavurek.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/94709351109.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/wukeme.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/39108326439.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd8cd1cf0---23413969397.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/lomex.pdfIn PDF document text
    • https://duvanco.be/docs/files/kemefa.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/wulekadunixuvur.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/67339652834.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/96488059321.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161445340f086c---10363696406.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/sodegoji.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87e9d71ba---vujijizawugefavu.pdfIn PDF document text
    • http://topas.lt/userfiles/file/defibazak.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a113f4a5c7e119ef5a9594a5fbf9cf67/ninatironisezipelovoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=manual+gearbox+car+parking+gamePDF 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_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 18472 bytes
SHA-256: 9ebe533d3ee97c124fefdb64c8eb70180b4b5cd70dc729909dfe3f4d28303c36
font_02_sfnt_off000126ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AC 10880 bytes
SHA-256: 1339cd950fcfd92ddbd1c40b6e6e1e3e9e04a7e6736bd4ea29a4a4b018d49ea3

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