Malicious PDF — malware analysis report

Static analysis result for SHA-256 8093358421e62b3c…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 07:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84ed341f1ad93f57ecb27264d6367aaa SHA-1: 75b0f541bfe2a9458ab288f7561741707e236c64 SHA-256: 8093358421e62b3cc8d02c4e8827c0051cbcdc04c2bdae5223178df12b24737c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vivo-mebel.ru/upload/file/79121392063.pdf In PDF document text
    • https://10fci.org/userfiles/file/64383316073.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210807051359.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/siloguxisokemusepofavipug.pdfIn PDF document text
    • https://ms02bet.com/contents//files/69538796544.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160853cf4569a2---sitiramubarorevozomagoje.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/dokupuwomuwusikavujodul.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///vafuwazukewupikovagu.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/zeviridarapiralipaka.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/f58eml9970i6i0ojh01fb24dj6/fenojubudijato.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210518121656.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/vapikixaja.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e39c9c8687---86279777781.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/da3cf617ff4b5f7bd8d392bd4216a54e/bokuvofazadof.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i1ba3lejsala0udq21o22u8pb6/kapelefakaxaborotobu.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/30564924766.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/35da70c7a3248e824a659878f9ec1e4c/93553597476.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/vojutimi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zenajufagojedibugivu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072e68ed6691---wavaxegivugegumofubuv.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/29354519951.pdfIn PDF document text
    • http://ruresept.ru/files/file/73830773501.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ca0985cd2bc196024c41814cf1c4f049/25089724158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pitman+new+era+shorthand+book+pdf+downloadPDF 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_off0000cca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 17268 bytes
SHA-256: 353277a96e03b9f690dd3957a6d7c1471fb646d12ae691a47b8d27e6dc18d23b
font_02_sfnt_off00011069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11069 11084 bytes
SHA-256: d697087c3b286fecc696351dec382570aaf088ee22b7f2650033ecd338a02cf7

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