Malicious PDF — malware analysis report

Static analysis result for SHA-256 979b52ecef2fb32c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 21:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50b4c0124d1912d03d1bc29c5c93aafe SHA-1: bd9d051adece2a2d0a91dc8c2c5493897a0ab3d4 SHA-256: 979b52ecef2fb32c8876ec4ca1600e71e00af1ecedea2b9aaea5e49d05906f16
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The numerous external URIs, many pointing to compromised WordPress upload directories, suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://archism.ru/uplcv?utm_term=research+paper+writing+pdf PDF link annotation
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c31fa3b651---xanejipimid.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f836512ada6---98209832989.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b552a66a74f---newuruxapukepazuzan.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/65109907195.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/99604085203.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/21171549827.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16076020bcf6a0---69685486873.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bce595e489---tugofelupexegit.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f910f0eb005eb69d42e0c73f12a9ad33/49097370474.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edcc187db4b---35179471228.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/evqgptiphpfirjddk6fgvsgdme/barutokonofawepuga.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/55394007940.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/xitogusimofejojomedolad.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5d60f90f783fd44f245ed9138148afec/xowivazepa.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/pabovopiruxovaki.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc6dff1291---xuwuxikaf.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1629197464.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/23471804902.pdfIn PDF document text
    • http://imi.vc/upload/files/tagewugukogido.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/38103547568.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f3a464b5584247ea8fa2ec8e08f7cb85/wuzaburozo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zubupitezejifulida.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e4e0943c19752adb4672790afd54eaca/93023293470.pdfIn PDF document text
    • 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_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 10864 bytes
SHA-256: 6a95fde68e97601e14787393ba27d138f55478265079924cf713fa40ac1c0dad
font_01_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 17028 bytes
SHA-256: e9c5e9b6a3d9d3785e0464cbf225ddb42024b091858d51b059dbc415cc68777c
font_02_sfnt_off00011d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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