Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb7cca7611b77c2…

MALICIOUS

PDF

88.2 KB Created: 2021-07-06 23:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 88b989abced216cfa2d2d71801011575 SHA-1: e05911b12ceb6268de706684756b459534574277 SHA-256: 3bb7cca7611b77c2fcdc59dbd24b6d82988b75a8bc06cadf9dcac6c0f854d9ce
164 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 an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious content. The presence of a visual download button lure further supports the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=rdxhd+movie+download PDF link annotation
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdcc86c381---verimusiwebamapotofodazuf.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/21nf3al3rmnuoe2a5qiqq1mkdh/21174602916.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/d91ffe755a14f94a0964c3428d63d035/2556959423.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/vazasokexanefegujitilekif.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/tefitiludafobin.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0fd1dd58df8f47e14f68b6a975d4412e/ferozil.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160713faba49fb---rafapiz.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/bokijolidel.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f82d8fa16---pagukupiregazuvuda.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174c7bfd8d---86220771433.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/sakon.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/9b311ff1af1c29103b777602b379f019/57330952347.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/rabajit.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/80312197411.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b23a6776a459d5cab7f6f0c43073bc1b/73850357139.pdfIn PDF document text
    • http://brukbet.com/user_images/file/73568968809.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/62362800900.pdfIn PDF document text
    • https://service-panev.com/userfiles/34686178610.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/550397qffpjbkp3jlsthev9ml3/1853204204.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/53931571721.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/74i2l7j21se205gpcfpfocabea/84958310060.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/b9b212eba7e9749c4145ce5be1b4f955/gunomuravizuxosivodunusa.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/sazepokosolabiwe.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210620005755_9dm40b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 17864 bytes
SHA-256: be8ae22a33e129f6755b0cd2086104624e86ce128106ecc702d3ca8802ef1494
font_01_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 10444 bytes
SHA-256: d2014ec64e3e350bde82e6bfe8664796e94e6c648b481db3854301a126a0658c
font_02_sfnt_off00013b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1