Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2be7ddc80f07114…

MALICIOUS

PDF

86.5 KB Created: 2021-09-06 03:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34f4663929e2f8673acb3453a491e900 SHA-1: c472a1ca0ced3343c9ebbcfb65cd362dbb52490b SHA-256: d2be7ddc80f07114cc039c31b6e4664bf300a69b889a3e593b6fb334cc739c3b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as hosting for further PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristics and URL analysis reveal a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/323bel3tj8uj0a5e1m1khrto88/gasulobagugutoja.pdf In PDF document text
    • http://cdhsalumni.com/clients/28864/File/dajerolojusifumozetewu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4ddtcivj37csqe3rtski7q8ant/xiwopobavop.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/51711681674.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/sejotitugodevoxajifanu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e678c3e9---67423583050.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/llk49hic6go18guhm2ira65du1/limavigilona.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/4349042425.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/pixajefis.pdfIn PDF document text
    • http://lukinserv.hu/file/46411713156.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/liledidefana.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/38668389956.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/78915055105.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/19833086566.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/sijuto.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/tosifa.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b1a28d930100db64bad95d4f103bac52/35528465315.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/h44bbsjilo2o0c91n2qdu2g5aq/gatanajur.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/baralota.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/6730634938.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/31455892088.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ce609e0a8275907681911952493af184/jafekovativov.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ca5b0f187d58f48010a4b2af5f8f353/gekijavosudizupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pascal%27s+wager+pdfPDF 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_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 18596 bytes
SHA-256: 208e83d760b9514ff5ed6f84d69ac3a8841f680fb3dcccaa3fef30af95321c6b
font_01_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 10500 bytes
SHA-256: b6429e9352845ac8d0df69fea796888ad9a38146568bf422951e43a8ab7d73b6
font_02_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1