Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c70a1e1f9f950f…

MALICIOUS

PDF

98.1 KB Created: 2021-07-10 01:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 858aa1581533420790081c998a4c2979 SHA-1: 62bea0c40f2ac4deda33c9437898fda9134620dc SHA-256: 39c70a1e1f9f950f2928ec296a68bebc0ff0cdf3ce5933f0c6343047a941822c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan behavior. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and heuristic firings strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://faradtvandor.hu/picture/userfiles/file/ponetamusixusujiz.pdf In PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/boposaxuzidezu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d236237e6a---97336588090.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/365e0eb313bc9d49a3c6f9693e13ded6/95555290804.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/dfed1102784cc9db4372f309c5eb507d/83417959091.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nararava.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0ace1039---ribifaxapapezogaban.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/avpba52haf6c7t7jbspm6vs962/jexaboxusojevovon.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/runik.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/l50v0pj8973h5k252u3r5l1fmq/tidasedabitevili.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/pinavivusaweseko.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/85282602408.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/24541827152.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/50c26bc92ca8f5278960c8467fb72233/bulusumasamidivime.pdfIn PDF document text
    • http://apvn.info/userfiles/file/jewesewopidunekerog.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/cj90653786jmqscimrcm3r20nc/derotate.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/robugixoxivatexol.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/26955973553.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/b17cf7e7a55ffea30b999d6cf08c34fe/16186466921.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/2931775129.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b46f49ef58735130d08db0f3092c411d/31345142230.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caafe5791b2---womalubinale.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160842cf6906fc---pegepixapoduzefelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=essential+of+chemical+reaction+engineering+2nd+edition+solutionPDF 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_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 11128 bytes
SHA-256: 931618bfcbcfd50663d7f5192c3a41660086b48c0d0b54c2756ec6ebbdcbb9b2
font_01_sfnt_off00013187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14999 18336 bytes
SHA-256: 93323af9501d1c08177ea3fdaf59eabd85b2ee721d3e9393f09cb2057c3a3b5e

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