Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a016666ed4d645…

MALICIOUS

PDF

107.3 KB Created: 2021-07-29 15:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66cf81b68da66762a3326a2a50ee059f SHA-1: 1c4cb9671f3feafdc948f9e72ee6187952ef34a1 SHA-256: 24a016666ed4d645fda1e382df4a2dd143566d56714b506923c6e86e27bdc633
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute further malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious PDF downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a997523b---nufatowafifipozezok.pdf In PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/60e7psa7kstavea76sr6irltj2/79864964181.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/wufanerawunupafetife.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0871d40a3---dojerene.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/12204165825.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cd6964fc4---50188929103.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b759268d316---32563681111.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/13332840362.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/87504496024.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/61180848638.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/31229905792.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/5803296804.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c112a1ffa1---koxisajotejaxefufomo.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5a2445975c1c9743afa84c232b2ec737/xonurisobimonanada.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79a2f193a---28053095394.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/46306629813.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/73716804882.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/95742208579.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608212efd83a8---xenivepunesifofa.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cac65e310---bofuponi.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160737181d10c3---dirotunibibifebukejoruz.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/567e9a080720155c56a80c6d2dd4356e/suwurofeso.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/kotikakizavolit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=geometry+dash+mod+apk+unlimited+money+and+gemsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9D 4540 bytes
SHA-256: 2648356a3c4d2d5e32b644fa2212ac24aa6b558d485b53a1ca3aa2a0edf3eecb
font_01_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 17308 bytes
SHA-256: d714cbc5be71da9d52848c09e4b79e548a92f1854878f74df98642d095043dd9
font_02_sfnt_off0001391e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15130 19732 bytes
SHA-256: 964e711a57f032f8dd447d7756a33148ed4b028113b5c084560e0fc44e481996
font_04_sfnt_off00018496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18496 11184 bytes
SHA-256: 5a3f973b2b4f75bed2b05bc6890b02282f76b730d49ace484e2090e0b8fdfd42

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