Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a698d5b4956cef3…

MALICIOUS

PDF

87.4 KB Created: 2021-07-02 03:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ea8e7b5895751aadc61c2fb092eda8ec SHA-1: 44790c7d2e41de3cf141ed81542f89517fa32c15 SHA-256: 6a698d5b4956cef3b158601329abc4b0387d82f7d38af073a55efd44bb166529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leveraging embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=most+economical+turboprop PDF link annotation
    • http://exosportsante.fr/ckfinder/userfiles/files/7018497280.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83731649c---88432802998.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/07f7825b9bb6db5430062e7329f0f334/wemidunuferawet.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/nekajobiwujamoladasudiliz.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210628_9BF15D0C60B6AC54.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/gqk40ljbe6me0j50dh7s3a5ft2/wotozukowelirukegovejus.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/74045104920.pdfIn PDF document text
    • https://service-panev.com/userfiles/gukozurokotirodakasisuv.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210613044653_4a17yu.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/binafelolu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2fb1ece3b---zilukefakexomovurulupebe.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090cc598b583---kapamireredunisusikox.pdfIn PDF document text
    • https://dineflon.com//files/66668149877.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fc8d7f4bf5912fea2fb5274cc8ec787f/runojelevapupov.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/j8u5hmpee92nnk4jvotrhtljr6/48955048250.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160877400093fa---xewivifovup.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082623f2efbc---bukizesizowolusukanimara.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608853a840716---19182443303.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/48ce2c85b89d4c69b68b30356392574e/28537931273.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/58090310073.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce37f541ec---14693515092.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/68069bdc6f828dae832ecda3b373031c/wazefawotofolifivogozewa.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/29560406801.pdfIn PDF document text
    • https://menu2uplus.com/images/file/naberibatuvejafiv.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_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 10768 bytes
SHA-256: 80376b1c46319cbfa45a8baec29b7917fd65339d8632c9050f9b83d5662746d1
font_01_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 16800 bytes
SHA-256: 3f597b722407e57cdffeebf148f2f0130367c4e0ce2c076619fd2a516878e389
font_02_sfnt_off00013843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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