Malicious PDF — malware analysis report

Static analysis result for SHA-256 0662bd248b67ab06…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 19:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 607f84f0d3fe4e470045434e5fe2d377 SHA-1: 00d526bd5c162a4877d01714df1c6a59a3a62240 SHA-256: 0662bd248b67ab06247b490b256a6a8e0438df2b47887156ff1c8c4f5b45e688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm strategy, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM'. The presence of ClamAV detection and ML classifier flagging further supports its malicious nature. The document body is heavily obfuscated and appears to be non-readable content, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://medvor.ru/uplcv?utm_term=guyton+and+hall+physiology+review+questions+pdf PDF link annotation
    • http://clubselectionvoyages.net/images/file/bezazowagi.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/63464579011.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/leperebog.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1be4129c9---27782392249.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/78534949472.pdfIn PDF document text
    • https://activepymes.com/pub/file/74089287764.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/50328567183.pdfIn PDF document text
    • http://www.77ice.com/upload/files/70971384933.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/16752061799.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/35224178424.pdfIn PDF document text
    • http://hodori247.com/uploads/files/kubikebudodovogoxiv.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/babaxijirigupezabigizap.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/38445054852.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ge8qlu4p0g3jcatjpuqbm4folh/nesemusememivuwego.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/jetive.pdfIn PDF document text
    • https://ccskin.com/geektic/files/sosajumofumoxusenoduzix.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/4858026001.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/rosemox.pdfIn PDF document text
    • http://ch-yang.com/upload/files/40981017330.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210912_5B01505FB0D10BFD.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/bulizafanubu.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/wojawogifelozowekud.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/wulimetopakolapurugubef.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/sutoge.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/96236027085.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18b61bae5---61609204130.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_off0000b909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB909 19968 bytes
SHA-256: c045c5b63130830f22719db2215de13b69d36509140adb096d96414b2975602d
font_01_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 11328 bytes
SHA-256: 92eca27a1bd985b279d3dee2c289f77b406ea82375ae6c75a3ac4bebf7488710
font_02_sfnt_off00010798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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