Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67cf15980ac6cad…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 02:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bae35f4ab660391328391a65d83ede42 SHA-1: cb5d2e682dafb956567e259598dad0c3eaa87c2c SHA-256: a67cf15980ac6cad7e4b140d7ba883a61065f082b9de5d961164568cbfa54283
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. Analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms. This suggests the document is used to distribute malicious links or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://abzesolar.com/uploads/files/wevivedamupidazen.pdf In PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8v6s9vu91cpk7qmm7khdmrf2mr/fedimazejodolefijexa.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/25273c7eb0ccb110cbaa97381c44a573/viwuzota.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/junomutojiwakabanujetixi.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/3625aa290bd4b3307542ea00a2b354c5/59175201197.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097c86057c96---18654706172.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/navuwezigusodes.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/83111513929.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/ninidusabed.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/renijipilimemofo.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/dkgca7ju8shtevtgdt95kak914/74725147573.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/29770417556.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/buzutadanuzaxubivarogij.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/241843247635.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a72e5f304a80dea0d8e4ed83d710229c/xexovajomu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947c8367832---tibujokewodofidu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/90362751418.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/64706043774.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16208694115915.pdfIn PDF document text
    • http://masonhn.com/d/files/69538270110.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/61473366842.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/segenarijinol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mental+maths+year+5+worksheets+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_off0000d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 18444 bytes
SHA-256: 22047112a599bda8d164cab500044c7f948eb3896aad902636e5feb77c1dd32c
font_02_sfnt_off00011858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11858 11092 bytes
SHA-256: a24ac5d835080fd3f341fab85a34435225a72324d3d3a002d4028a506952f8e5

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