Malicious PDF — malware analysis report

Static analysis result for SHA-256 962b5bb59e1fb938…

MALICIOUS

PDF

113.7 KB Created: 2021-09-12 03:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91d726eece8429c1dfc837b133a55849 SHA-1: 1f532036377a731addb3a26f00dd9f1fb639a19a SHA-256: 962b5bb59e1fb938a52eba1a35abcb4a779b6bed3713c348f765f73418fd4261
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://philabc.ru/uplcv?utm_term=pes+mod+fifa PDF link annotation
    • https://magerp.org/upload/files/59711706209.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1b9e4c0148b0745c3a1901b3768979c9/kijudozixiwepo.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/18703615095.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/regiregusetexataro.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/58345629748.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dcf6c6eb9---wevum.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/bezogeziv.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/fevanotozexalopamevememum.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/xakobutawesagesofatagideb.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/fipipowikukibuvavubux.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/51737017135.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/26185094299.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906234839.pdfIn PDF document text
    • http://abc-tel.ru/data/File/vimegobulobabovijas.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/vutizovupadudoran.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/47891655928.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/viputewosumipabixamel.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137428d9da2f---zupomisixiwanubivawerepam.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/46627797476.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/91245205785.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/15460797633.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/1004472775.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B2 10168 bytes
SHA-256: fec50cfa70d5244cfb01d7ff9c3d1b54767de0758666e808dc0595cd6e99b27f
font_01_sfnt_off00014a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A79 25084 bytes
SHA-256: f71c7fc4a0e2223ab085a7a7deb50e023d231c57e7dafd4bfe68fedfa38100e2
font_02_sfnt_off00018a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A28C 16368 bytes
SHA-256: a28c0114021bb7495514b391ba22dec7c588601d3529739b74ba1bcb6b158ae5