Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80c8170f83f599c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 09:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 807293b26fd1c5d296b396eea60fd818 SHA-1: 3039e113324dbdaa115023b759fb087af39792a9 SHA-256: a80c8170f83f599c119daddfde89eee61086df6141b0f04f3088a3da7d292127
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicate a link farm designed to redirect users to malicious content. The document body is unreadable, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=english+phonetics+and+phonology+for+spanish+speakers PDF link annotation
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b6659ed1---sutigatobulowejukuragow.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/mumodokexigibumej.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/7784377527.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/xofolilinovowojelom.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb3adb1ba---74312679777.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/n7jmakdnh8vcsvri2iu2a2irh6/66981192074.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/90960675368.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/94645374446.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/14343203898.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/85160469312.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/lpts4tv49arfr82qd3islsqato/53434361047.pdfIn PDF document text
    • http://fitviewer.de/files/file/niviruzipale.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/finufelunemutemeb.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d9d8d91610718fb52d7e14d92e86f19c/67339898265.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f37f08b71---61984430845.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/s93var7v48bdefiisce0k051s6/zofumox.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/rodukimigolinupa.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/66310297529.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/014d4f7306f4bb55ca913fcd3010e234/27780883705.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/svl21p0n18l58hl43p9bobi1sg/sepogutudutifewuzijonugi.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/dujedifemilukizit.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/46545278413.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/25582009218.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/zoxubeligimelubotoxasokuv.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/gusix.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_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 17156 bytes
SHA-256: f2b69a27d7abce4a3d2a37f277bded90260e388a76bef22e8cca422159de69f4
font_01_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2C 11088 bytes
SHA-256: 79db779215fb679e3f758d64533f457ea4bf63c20c7fdc3c8b3ecffb2937d6da

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