Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dec30d73ced3dc2…

MALICIOUS

PDF

92.5 KB Created: 2021-08-12 11:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0154171f00d4f0e8cbd4d085e69e41cf SHA-1: 70bd7f5f8541ff9e42ff392a21b3be68b48db3df SHA-256: 0dec30d73ced3dc257a9d01aab1f38f1893d7157f3d1459aad58310d617dbe3b
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://alpha-th.com/userfiles/file/37280397955.pdf In PDF document text
    • http://firewheels.pe/userfiles/file/15401138220.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/91435099879.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/25765337466.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/xeturobewosoremuti.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/34ff3a45192e7ccc66fc5480d5ace5a3/35748638615.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c04229b6c26---82872412970.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab772e82191---48916992226.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wilabapugudanug.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/69223510363.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/zogodagovuzafabawonutuwi.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/91280454515.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/dikigeboxageto.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/joxeverezubigetov.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d5235381---zufajovodiweketuxiti.pdfIn PDF document text
    • http://allycatering.com/userfiles/68550030522.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/73828689799.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e578df6c594---86370811850.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d379f98adc2---69709893953.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/45112033328.pdfIn PDF document text
    • http://schokozentrale.de/idata/detirivugulogimifewumekux.pdfIn PDF document text
    • http://tkvolley.pl/upload/files/20513499145.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/7647298645.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/q7ukqauio50tsitaflae4q5n4v/pisemokinelizofapawugevo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3lh2o1vjntqcs729qpfe9s0bn3/22016527680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=high+school+business+math+textbook+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 11392 bytes
SHA-256: be43640b009a56ab9d07823eed37b4c3263c37624e6ee783638417b182fcf39b
font_01_sfnt_off00011ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 17040 bytes
SHA-256: 715b8b0e1eb4657cf144f24ae733ffe810fc52eaae99391febd3c1094f763461
font_02_sfnt_off00014b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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