Malicious PDF — malware analysis report

Static analysis result for SHA-256 37422439dcfacd87…

MALICIOUS

PDF

88.3 KB Created: 2021-08-13 08:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: b1c7c67127a9219fc045e57d8693ea58 SHA-1: 262280e2a43f015f50351ac997ca7bfe9ea6b6ed SHA-256: 37422439dcfacd87493be577553b491abdfc80bbc8fa39d0b7c0edc4df51ed9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://studioassociatoemc.com/userfiles/files/16482345279.pdf In PDF document text
    • http://sintellect.ru/Repository/file/rawusewitamaxa.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/sidaboxeruvafog.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/78540411859.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/88455195587.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083140309da0---61408176537.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/94498206368.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af93e872f80---gokupapibovafuxe.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/rofaro.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/k5s620m8jq3u7ucuiio24de766/xivakazulusufefedofaxiko.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/591b0fcfc15f757b7b09409a8141f912/tarodifutofegegagatalu.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/pejisigof.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba74a79b45c1e0b5cf74689486c78a28/vaputupixedeweribuvupozad.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/a6b9f5961bedbc31e575e29bb26735d2/tukifapamatotigogo.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/763sme28h9bd1h5l6kd9gssak4/68008805581.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/88803842049.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/18594074623.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/jorizejofafugupagi.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/94261083462.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d6553742---84390041006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=laminas+del+test+de+raven+para+descargar+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 17584 bytes
SHA-256: f13a7482561e395bf23f1c53672f9c09c03235b6ba455010d8258b8ce78d7fbb
font_02_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 10868 bytes
SHA-256: 46c2a66f37dd4ea229ad16bf044bf4553e06407442829eb9b56c352f877e41c1
font_03_sfnt_off00013cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCE 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d

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