Malicious PDF — malware analysis report

Static analysis result for SHA-256 778415e13c585a79…

MALICIOUS

PDF

86.3 KB Created: 2021-09-10 13:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2fb8029b4ce385a64af2bb0b2f48e891 SHA-1: 97beeb2ccde374e932efce55718eec7a5e1765d5 SHA-256: 778415e13c585a79b9bcff764b01c8657e972036c469e345b0933d0797f42d2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm with numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. These links likely serve as a lure to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://infrive.ru/uplcv?utm_term=alice+in+wonderland+1865+pdf PDF link annotation
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/5561234741.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/juloj.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/masawenukodezo.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/62487069079.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/gusidufakirorel.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/54780472104.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56312993130.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/r6rj4f7p8t28d0heab0mrhvl2d/78766985514.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134cff12c867---xovotifowujopeke.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/11261179650.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/11f873ff9f7a88874eb346e0159f32ff/69201401722.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/4154d78fa7085558c68db3c97c179883/75232852559.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/15087971900.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613239a5aebac---mexefixifu.pdfIn PDF document text
    • https://renetravel.ro/images/files/72316578334.pdfIn PDF document text
    • http://recrute.fr/files/files/daruxunakexofaxadima.pdfIn PDF document text
    • http://mamitobe.ru/files/file/20868339515.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/14935706034.pdfIn PDF document text
    • http://safarang.com/basefile/files/27402932242.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vct09gtbeiqr8jgj5gnisnqeil/42750250688.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/21031779387.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/65406031232.pdfIn PDF document text
    • https://biodez.lt/i/File/43172304619.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/wizufefifi.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_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 10976 bytes
SHA-256: b91cce234e3a99c757ebdf2690746b0a2b952ee9d494cb924fe2fdc76439c5e5
font_02_sfnt_off00011cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 17984 bytes
SHA-256: 3c9300562ae6a432f914ade385da67cd21d0d2a56e3c03a69d51be49e7f2ac79

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