Malicious PDF — malware analysis report

Static analysis result for SHA-256 809706d8612a6780…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 07:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6720c86cbb8e1db79732dd090d3efd93 SHA-1: 337ee6aa1f2106cfacde95a421de7ac8dbbb4464 SHA-256: 809706d8612a678017a2aac3d530723238f0888fab8c21ceb05f0f8b2fb43256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the overall pattern is consistent with a malicious document used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://france-ex.com/vuzovakogudokobuso.pdf In PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/lupigonag.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/4qtfcggvmsj6003j338sen8u77/88550893627.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/lupoxurevubuvejajiforen.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/jezekabuwolewerijoj.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083561db42c4---talafavupatoz.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac27f48b1bc---9671998970.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/45765902581.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dee6317d56e---fitokesuse.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f71f8b4e4d4db5c17f26fad3fea76c71/sajenitopalawu.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/58348180996.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27852106b7---ragelo.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/ranokozutedarifebovufozob.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/32210525530.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/1434578724.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210724083358483159717.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/bf426fc8b637da437bb056b380b0671c/dosejuxenakeki.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/bakiximelubolububuxapipu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f61498ec7---nedafewoduzazobo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6d9ce249c4312d7967f321c647bd0fa8/bejazobu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/c53uv8mi9v17sac9k4u1k2v123/sibobopuvoxojupovasem.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f227a2edc---molusalowelafimov.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/wamanujibubijezasodatak.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2aae97edf64364ae5ead85c59dd043f9/94483049679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=arm+and+shoulder+workoutPDF 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_off0000d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 10680 bytes
SHA-256: 16e08d0bb620d1602967e45ca7f3e009045fa8f288366ceda0f632ad3a381024
font_01_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 17672 bytes
SHA-256: 59cfbe8623f66e397b53a9828df22477331bddd2fe2b28a07f351eb9ad01fdb6
font_02_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1