Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41fb4d778603465…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 21:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd423e547dd6e8637c0e95cd18b825c1 SHA-1: 5742550b75ccc4420e7de5b79ea4025ef352de7d SHA-256: a41fb4d778603465d2cabdcc62f54caf0ee2f77d644a25d07323fec2ee409bed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm indicators strongly suggests an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://beloezoloto.ru/userfiles/file/71448564099.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac411c693---71373420352.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/jufomozivegagorezitorom.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/16643085997.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/dolapipekufiral.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xevokojawoji.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091f92c4b14f---27838063662.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/newikivuribupifolulazago.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/gapemekeb.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda9595109---buvesusaliberikemiri.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/94360d2647811b0038c8adaf08036ea5/siviperejokejep.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/xonago.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/somew.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/jizizumajosag.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/f3a8354eb075fd185c0cbceebc96dba0/29899895647.pdfIn PDF document text
    • http://hanifeugur.com/image/files/sufepakuniwavalu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a34bc3109---97127669309.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/gupalalezosizazasuwige.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/xobofevagujovonirev.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/sokiku.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa051232510---28410877124.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/zunevofusokesepi.pdfIn PDF document text
    • http://ccsl.asia/files/74104302213.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a9014d1368a---78018284560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=past+present+and+future+perfect+tense+worksheetsPDF 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_off0000cb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB13 10860 bytes
SHA-256: ba51ef997c0ade95936a02c72de5a404a21135d49d68ddd67690299ea1e74aa3
font_01_sfnt_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 16688 bytes
SHA-256: c02503c7ca9f571954ef1396c681d7eb9316eac0d8a18546a714cddaf1d43ded

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