Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2547ab0f92699e7…

MALICIOUS

PDF

88.3 KB Created: 2021-06-30 18:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4eeaa721129ab7ad4d1935a04bf9d9b0 SHA-1: 1210dd3812e11970c00a97492a0dd309aaaf4ed0 SHA-256: b2547ab0f92699e7bcd27e1a678d6a833446d8cde95cf6b65becc445957b80f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user away from the document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/tfsp12qcjpouh6okh5ovipssj1/93474546771.pdf In PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/ba24d38df80df1ee1fd49b15a4848b2f/10762193157.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bc9ea92cb---merowoguxelevesuse.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/60733243295.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78f53b8da---perikoju.pdfIn PDF document text
    • http://bscartridge.com/pic/76395442156.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dae38668b2a---89208975760.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2ff52ca0961f05829c83443328bf60cc/5669148066.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/82270761192.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/88894005927.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qthhgb4caqr945dpif9gimfr31/juwasokeseneminepul.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/fc5619d084ba985c95a27ea5674f4d09/paxaropuwoboguvijikefof.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160988574cc705---27901783025.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/gubidowakurasenabokemezi.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/5755128218.pdfIn PDF document text
    • http://dietmoitangoc68.com/upload/files/12684881380.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/rimiguretixowitipezoguj.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/veto0oc6ikkme9c2pnvh9d5sv8/muvenegovutat.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a249eb423f7---vomejaxojagijekupujuxalas.pdfIn PDF document text
    • http://normel.org/files/upload/file/wejavon.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d74ea50f4c3---75999979929.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/kenizewimekogibezulavab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=right+foot+to+the+leftPDF 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_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 16676 bytes
SHA-256: 41b0902d2a2e2e5a1f4e5ffe9937d73efb4c81eaa25c12b6d28186ed8db15521
font_01_sfnt_off000125ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125ED 10004 bytes
SHA-256: 9de388cf70eafc3de2b344966e78a024dbbb06e1f3690c4ef801414e8b7c35e3
font_02_sfnt_off00013c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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