Malicious PDF — malware analysis report

Static analysis result for SHA-256 7550afcd32a4784c…

MALICIOUS

PDF

101.1 KB Created: 2021-06-28 05:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fcb34a93a4eca5fa90c45fd23182a93b SHA-1: 68f0c396962d6cf0de4d4479fcf85cb94527c67c SHA-256: 7550afcd32a4784c3beece2bdc97248248d78f566c8ea38b1df887ed1ae93b6a
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. It contains a link farm pointing to numerous compromised WordPress sites, likely serving as a redirector to malicious content. The presence of external URIs and link farms suggests an attempt to lure users to external resources, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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://wastran.ru/uplcv?utm_term=custom+letters+copy+and+paste PDF link annotation
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/58m1jpda0fb711dmakolbgbmbj/61524502116.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/qckkj1r24kobvpkp7ng0prhhan/21817804297.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160778955544d8---72214397157.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/4bfuq83cp3pie7ri6ra87ce8o0/telumi.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/viletesorojaxaj.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdbd0204fd---gujozowetuzezas.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076851fdfc5f---58742586529.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/lotovajajoda.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0e3407611---midanaganaguparalo.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/73421914180.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16098545a23b75---51266176312.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e5cfe39b30a3021c6ac745fdaf2edbb9/12277903720.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3dfd20b20---80526786784.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b8e828a1b---rejugipedaxefujen.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/vufuv.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/75547958560.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/77235020635.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160abcead43aea---50723296824.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e88868d69891c39d258d53434e3437cf/tovuduvaporitoferizen.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/zomomuwuruwuj.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a8e9727c46489abef2f7857b31ea9437/51075811615.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adea6b28dcb---farenuwod.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/5f7a05fd5bd5a1e0a2ceb2615c4acb05/68487619524.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/4b7f8aecca9186a0a51652f4b49562d3/pevadogetikal.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/2782960636.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 30712 bytes
SHA-256: e9ed7a6d1f1f1b9ac8cb384d7cf017d8b683a9fb69117fb4828c0ee9178ced58
font_02_sfnt_off00014eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB2 16100 bytes
SHA-256: 75b586f21231a4504bd8518f65a798e04f1d3736e1680262625002f5996a6364
font_03_sfnt_off00016404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16404 10828 bytes
SHA-256: e358add8f71a58c53e0ff9e1240ed9a015531c0c4f87f633f86e124a7fe21a43
font_04_sfnt_off00017d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D0C 1916 bytes
SHA-256: 5ccb643eef913568f29dbed7ac62cc7aa68c4092f3b8ee1ac133e7813e99bc26

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