Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcce046a7f5b25e…

MALICIOUS

PDF

89.7 KB Created: 2021-06-28 08:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6ff44c9dee2605c66356ec6c2622ec1f SHA-1: 7edbd29445623b42d68347e330d6584b110fb3b5 SHA-256: 4bcce046a7f5b25e2006ee2e156a5eb04807316a96313e365653ba2b6e9972a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986fbe5b555---38884538115.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/9nkngu5uu9i8ka6v5e9008iock/widazabimupigu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f67de08d32---lejivadewerinukokokixi.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/bodebutoluza.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6822da7c2---10086870425.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cded0e8bb---20582372034.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/fatuwimojedojepevidewuw.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c0a3fb249c9350de6bd2cfa65cb8d38f/90258800122.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/70337895569.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/jasefupakiwune.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/bf5468b493f02713c3da81810c6915cc/butufoxibabedut.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729745cfc1a---dijugumozevabesanozu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ac8623981---wesanumoj.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/75399784744.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/rubobujafud.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/55599304119.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16092ec424458f---46921211458.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16070c8e84e364---45800119376.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/e0a40atlkj8vonu4st1sb6iign/mojuwuvix.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f307a60da1---pesabevibapazekujipak.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/20503807289.pdfIn PDF document text
    • http://texmet.pl/userimages/file/ranafejiwudupuwifew.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/38dd1a31ad200e41645aad9c6dc26713/lazomerajonitos.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f8c06746cbf553e87b82c5778f06804f/45517637897.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/20136065141.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/nabiwijetafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=largest+boa+constrictorPDF 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_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 10456 bytes
SHA-256: 84d4552f5174ea6302dc7d98cbf08db0633b3a453841677177b386f52a88aa52
font_01_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 17740 bytes
SHA-256: c5102c3c0434203675746376f2440b4842a420b33e26850de0629f47affb7703