Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b8c6148d474a6b…

MALICIOUS

PDF

97.2 KB Created: 2021-08-10 23:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3115ec3c409bb66d9617366acdad1f06 SHA-1: 268e6fc90f44b0b02a3f8ac316a677bc42c68569 SHA-256: 43b8c6148d474a6b7fc7043cfa3d39db77190d39c48433f37dc27ffbb1445901
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to other PDF files hosted on compromised WordPress sites. This suggests a phishing or malware distribution campaign where the initial PDF acts as a lure to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://archism.ru/uplcv?utm_term=ferdi+tayfur+%C3%A7e%C5%9Fme+filmi+full+izle PDF link annotation
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607183aa812cd---satuxaki.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/8feda91d3342d7344a230e91138b3a96/1337473787.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/podufono.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/431953296.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/73226680938.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/18655966683.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/51885676592.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3671741222bbd64fd5f2e6570edf0cd4/bavukotodulupeje.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/13937577363.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e78bddb4---majokitexefisigokatidijum.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c4eaac0fb53ad7891ff18f6b2f73ee9d/9933326361.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9e4726b620ada14158040cff469ec8e1/54387720555.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/11802208526.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/bopeg.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92da021eb2---xegip.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8b3b3e652---getuminefowimeromez.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/46fa9a937178ef7c934a08d2585d34ae/31268088160.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8c1942d5d---4702528974.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/vosemopafiwenurukorezot.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610b3b5169593---23888869421.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fceaa1e2f5a---dozibipezarudosopi.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/83128713204.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a852110f79---42750243278.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/48099616919.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/e8l2nq7e1h5udkake49b0ugck2/tebikukuku.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 10812 bytes
SHA-256: 3130e8566efb08402606d49d104e2bbec07c3e6d6c1a75357cbe46259c497cde
font_01_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 19844 bytes
SHA-256: 659baa02b4c8b5d3378aa7b825c7e6a24dbfa6158f9e996ffdb6bf4d56870456
font_03_sfnt_off00015eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EED 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd