Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87f945c6d13222a…

MALICIOUS

PDF

94.3 KB Created: 2021-09-07 06:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40cd156e621328a76e3b83ae83c800a0 SHA-1: 401d9abcde71d13b96d42e04d00c07c7e6185a0a SHA-256: a87f945c6d13222a970ce5d1e72f70e8305cb2018497251b7a4ec3fb70962ff5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://xiaohecollege.com/d/files/kipavamebaxobekosugu.pdf In PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/csjtf36pisgk7kda19kldpqqce/titasavawivinekiduwu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bad969c8d---46543118903.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/ligijuxefupuvager.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mupakowipapanizuvel.pdfIn PDF document text
    • http://go-forum.cn/upload/files/7010108184.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/505ca916fc5e57bc278bfdb61ced919e/64527507574.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ecd85f50---18049407984.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8b9bbf98---24962968538.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16087f33e7dbe2---gupinowewadedavexowase.pdfIn PDF document text
    • http://art-ball.net/files/file/jamolejorux.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/76242246922.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/gewijaba.pdfIn PDF document text
    • http://z500.si/files/jadis.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/gojova.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/bibevakuwosepef.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/96981392396.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf50d769bc6---79963521239.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d990a3798e---tosaparovudodifebinobuf.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/17677647316.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/zepufawivokolafivowu.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/19726992792.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/bezigobawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=glencoe+geometry+practice+workbook+answer+key+pdfPDF 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_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 17668 bytes
SHA-256: 698852961410c531a22a94fee9ccaccbe8d30e5d8f8e7dd53ec1f5aec464a1f2
font_01_sfnt_off00013848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13848 11436 bytes
SHA-256: d535514b9242c63fb0faa4ff565b966894fb64c04b78613147b8d898e45fcaaf
font_02_sfnt_off000152f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.