Malicious PDF — malware analysis report

Static analysis result for SHA-256 792a165461ef7488…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 01:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 099fa8b3015a543900ca087e53605f62 SHA-1: 81570f1e17ff0c103e7a1977701271c439313824 SHA-256: 792a165461ef74888ee878be93dffbe1aa72c4e941274e546bcf3cdbe105fafc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to domains associated with link farms or potentially compromised CMS uploads. The presence of a 'download button' heuristic and ClamAV detection further supports a malicious classification. The embedded JavaScript likely facilitates the download and execution of a secondary payload, contributing to the overall phishing and malware delivery objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://uran-berlin.com/userfiles/file/nugerubuvudakubafuk.pdf In PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/zarenoregilabat.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/32472217626.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/zarorulajuvun.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/80588452713.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/borojufurarided.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/22044259316.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/88766356561.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/kasiku.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/pezilukepazikanoganelulo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ifulanunavukuriwobanak.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/wusab.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/27934683763.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/wokujibejagudiwivan.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161329d71983ff---39951989080.pdfIn PDF document text
    • https://motecx.com/images/file/nosetewib.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/30971427798.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/49982889803.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/97967678594.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d38d23a1---jikelutuxoge.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kataxebupevi.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/xikixurazanine.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/61350642936.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e9a2d6d78d3db69b6d5aad5d89c6f35f/21255368491.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/lijebejukeboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=another+cinderella+story+full+movie+onlinePDF 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_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 18284 bytes
SHA-256: a7da29d9c02ac6c0f9a8952612486a27312431eb99921b0644c9a74e9380c3fd
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 11004 bytes
SHA-256: 1c58651734b83245070f83544ae49a65c53abaf136826f09b6f632f1c7c8ed62

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