Malicious PDF — malware analysis report

Static analysis result for SHA-256 94bd8790dfed5727…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 06:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 943db3ca8d57454a1898bc4e68c4809d SHA-1: 7bac081e26bf0522337aa97cc94e04130d6c26ee SHA-256: 94bd8790dfed57272273017beaeadf503adc29c653d7e2a90fa5f0cdbf912a71
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://candientushinko.com/images/file/29098858732.pdf In PDF document text
    • http://greensquares.in/userfiles/file///87071459286.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/mivilibalax.pdfIn PDF document text
    • https://ienter.bg/files/jepumafamumibeselobiko.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/dagivul.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/wafesaro.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/64175197076.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/73608677926.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6b8453c23edd6dfd7680737a5e43cfab/jubisorudexaxiwutowur.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/rimaferoxekudote.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a52b52e1a3---18607185276.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210917233120.pdfIn PDF document text
    • http://storemisr.com/uploads/files/51603154645.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/73227126253.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b79cde27---zusolipotuxozilolojakov.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/39339654571.pdfIn PDF document text
    • http://jcpingie.be/public/files/nowawalobe.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109031525266066.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202192157425765.pdfIn PDF document text
    • http://nanopena.cz/upload/file/roletipebetikar.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/femamigikebuko.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12351728914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=farm+village+2+apkPDF 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_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16900 bytes
SHA-256: 531e89310cb2e1381548c364d35069eac428c28f0ba099d2912aa0b82d632348
font_02_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 10360 bytes
SHA-256: e1001886e359861fefd49fde80cb8eb0ecc47663957ecccc03b02a8d7f76a66c