Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c236572492e8c5…

MALICIOUS

PDF

88.0 KB Created: 2021-07-18 17:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ebbe0f08c228d847714a89f70316c269 SHA-1: beff525632958ca8774143d663206344ff3e6fd4 SHA-256: 70c236572492e8c533943764e4f516efcf4b59bdf37b59a578b0bfd268329fc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to manipulate search engine results or redirect users to malicious content. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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://gdlianyu.com/uploadfiles/file/wopodasiwozajofafulivedax.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/6jbgp9q5qdqoaal7noe07276kp/35330256493.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/teliriwudutoletoved.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/e1f0c19475f87f8bb3d0aa7d9ea7db27/pudojasimilurusifebud.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/51781273297.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c78e7327b7e---kezeluvafatikem.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609dede0dfc38---34431026024.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/14917688951.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/18391216355.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/sinif.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/rixusakokotamiwejir.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16070485a37371---nalogelidogupi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607726442965f---56180510861.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/51261904742.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/62059981131.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/e14cd07d1c2966cb1ff9811a9d37c365/pilakuworib.pdfIn PDF document text
    • https://drlanda.hu/user/file/nepagirag.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/vipijanimawaguxuvove.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/vedemofutinir.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/65164024199.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ade7a9677---89759608381.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/99189267768.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/64c507e30275e56da297448596c58683/suduwabelazikozazinen.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/vudafawuzoremosejobaga.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/04f2f2f002649bfd6f51c419dc64f1bd/xefifitiropadedujidozul.pdfIn PDF document text
    • http://ledins.lv/cms/file/821035909.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/vl9u7iu77uvb0s38tnvn737bap/42847804287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+the+master+builder+in+clash+of+clansPDF 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_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 16628 bytes
SHA-256: 1038dd79e301207f3a092e538ef0674d3926e40d2ca1df55933505111e244723
font_01_sfnt_off00011e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13690 11240 bytes
SHA-256: 75150d7085b06fc3bcc4612326bfbc367acfc353e02f52da80ad35ba8cf71d56