Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d82cff7e852b3d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-12 18:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 049c20e7e44d02ff7f5d9606839c16f5 SHA-1: d695e6842df8e4f219f9bb127d89e9bfee86e080 SHA-256: 70d82cff7e852b3d580c9b52e1aa3d190387c659f0872c4496652d9effaac9e3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://akvatoria.by/UserFiles/files/lusevafabalinowojavosali.pdf In PDF document text
    • http://eprdel.cz/userfiles/file/27510761117.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/gojije.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/mobawudazodel.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/sotinadovad.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf62c2a78---lenotanamesinijot.pdfIn PDF document text
    • http://airzo.net/userData/board/file/73072808192.pdfIn PDF document text
    • http://indemo.pl/Image/files/vejovebaxot.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/77333942562.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/bezunu.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/dofexafagofizinikaxubu.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210909010636.pdfIn PDF document text
    • http://metzlerranch.com/userimages/lijupijavosononufasogupa.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/padevamewubedevezor.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/kaxozedazamewukijafo.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161326b8a4acc4---88868376400.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/70693417293.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613489c2cb594---rolamop.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/tewemefowoduzuza.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/12524dace45659e23586bc2a682d2c32/21185274987.pdfIn PDF document text
    • http://sro52.ru/uploads/files/nemoxavitesifenofadena.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/90112637457.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/99044001256.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/j04u6u2c1fn62rq45aq7qlq77m/61179328694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dream+online+2+apkPDF 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_off0000b263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB263 10360 bytes
SHA-256: bb565f1e61d7dfd0836a4bd8549126f905df9dc9a20613f1c634d229bfc65881
font_01_sfnt_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 19040 bytes
SHA-256: fd4ed7360992773bb329fe507607a498546ecfe19e26e37ed914bdafad187a9f

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