Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef9f6db10ce12cf…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 20:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5334d70bd18c2e4b6db0f1ec599c7135 SHA-1: bb0642819c58cf25e8064617dbc23fb28c6b1f04 SHA-256: aef9f6db10ce12cfa3942e8e4a796a6ccac63a7d9e81b11fbeae83dfaaf3e379
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a link farm and the ML classifier's high confidence score indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=switch+on+android+without+power+button PDF link annotation
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/9fa211fshagtru4kteanga8kj6/86513830869.pdfIn PDF document text
    • https://stotex.rs/files/legurewupelapunet.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/pawuwilaxozexarobad.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///31114660576.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/nesekenikotonik.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161377c71f137d---woxeguzim.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/lewozatale.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/99232924460.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/29209488595.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/xonodenatoxidulumebo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161344fcc10c20---nerubukuworotal.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8ec7104e75c57eeddd8d66651e40d0ba/mujireso.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/46980226182.pdfIn PDF document text
    • http://anindecor.pl/files/file/5566231071.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/31291672540.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/zoziwexoporiliropubabime.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/37763326260.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd002e7406---naseneferimutolagorev.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/1402151534.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/kijafekedaxojomaregura.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/43259138506.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/gadirusu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1A 10796 bytes
SHA-256: 5e1dba8929b8f6c4a1dd010e348f6cadb25f474255ac4090e355705c3a11c294
font_01_sfnt_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 18148 bytes
SHA-256: c70ece6937f687361c520b6c7478b54c65de18313bd6c880a0da5dd17ef0693d
font_02_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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