Malicious PDF — malware analysis report

Static analysis result for SHA-256 6460761f46a874b5…

MALICIOUS

PDF

79.9 KB Created: 2021-08-28 21:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 0350af7525592179c195e4a3db421f85 SHA-1: fa373fc1353b497943408bdf32c1d1238982c8af SHA-256: 6460761f46a874b5335c05dc2aa43bf2ea7d5efd9c179153c93ea4e90c6b1fb5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and URL distribution pattern are consistent with a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://minipit.com/data/files/84735456625.pdf In PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2abf8aabcddda8a69bec68b16c4ef695/36319494743.pdfIn PDF document text
    • http://ausafe.net/images/art/files/35335566900.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/pibakikimuludubutabusixo.pdfIn PDF document text
    • https://gangnampools.com/contents//files/tabutawejenavubaniroki.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2b3d0fa6088cc5341f4eced174e23f3f/vudazatadubusa.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/a0b60pvl3gooinmi5ld28q2jah/kobokolo.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/viwojujovul.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/19573669524.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f939697c80---muzubasoroxa.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/f67e430b2e9b334f589b1949df6cde3e/80205372028.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/40fcfe98c9c30a82e0938c4707198146/gibelusoduzawu.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/55618273574.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160806587eb1ff---67828490492.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/40917948650.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/diwizopubuzotelenufazu.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0080ef656---rawalasuzo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160710f481582e---73876328950.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/vagiwaferuf.pdfIn PDF document text
    • http://kite-surf.sk/files/pudilo.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/2684492177.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/6585379824.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/lomasufegilabizizaguj.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e75eb06fc7---43898990962.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/37332092060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=isoborneol+boiling+pointPDF 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_off0000d534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD534 18012 bytes
SHA-256: 31d8df0fc5ba93eaa8226519c92b89e2661f0fc117111a743ff60a5706dfe111
font_01_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 10356 bytes
SHA-256: 929ad4aaae1a6f12fedda692b9feafb7d1ebcfe357932ff3469c435a7ddec4fc