Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6dd0a8e2025761…

MALICIOUS

PDF

84.3 KB Created: 2021-08-16 03:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b664f6c4743c43f8675c681aa8b9a65 SHA-1: f9275632d28ec521f0484b2b7be8d479bbe76b04 SHA-256: 4a6dd0a8e20257618f3f38910cab74554cb253bc00f49b307c27377f10a80844
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures for phishing or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783da5738b5---wudoxenesusog.pdf In PDF document text
    • http://hongshengfish.com/uploadfiles/20210630/210630052244994264ti2p47x4bjig.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/41957821953.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/sofesoz.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/6723091343.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911e1ebce31---mabovewujosiwujogomibu.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/93483375565.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af58818f3ae---vikiropexevumozusid.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/005f10b8ef37d473b9d6de629b80372e/69567178164.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/48535641723.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210805023746.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/nupizi.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/sb0snepdvudru4vpm8tmr6phl3/wawisexitixujej.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/41548573486.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63704971460.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vurusese.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/51204319119.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607868c08e49e---pagelemu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/eb1304a6d491bbb0ceb95ff549a7a297/kewinelogofonip.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf601f24832---44256165042.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/sowibofutuzi.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/83932389085.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/30920880895.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/riguju.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/goxigotegiveraxos.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5da7fef806---63982999746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+mail+server+is+hotmailPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 17324 bytes
SHA-256: de36a6afd0bd65a9056c8bcd036449a22bbe82389cb33f98d6881176f101aafd
font_01_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 10328 bytes
SHA-256: fe0b403714dbb3c2ece94c80297abfe468f98046f2f5682008888de12ceb81f9
font_02_sfnt_off00012a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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