Malicious PDF — malware analysis report

Static analysis result for SHA-256 626a445c5ff8d50c…

MALICIOUS

PDF

91.7 KB Created: 2021-08-04 21:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c101f056c693413169a6f6ffc0a0eedc SHA-1: bfb71b4f4ff6c1c80dfd2c054507e61ba6634073 SHA-256: 626a445c5ff8d50c371289d45968ff7242b7158647b6988b2dd9255adbc5f6ee
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other potentially malicious sites. These links are likely intended to lead users to phishing pages or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=ejercicios+resueltos+fisica+y+quimica+4+eso+bru%C3%B1o PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e47122dda---waxiz.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/fowadaxa.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/11582059448.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/rigutokolamojizadovun.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0662c6989---94493756032.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9a9c38d07c5b757b7c685a8b4ae715af/12199320187.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/655220133.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160be6e4e5e2e9---nofaruper.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775e9b05fc4---juvigezevatujogozed.pdfIn PDF document text
    • https://hssanesteban.cl/files/xewowivududusematovube.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/turitovanafaded.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/d1d57a93be7c5250c04850a2bdf5bd94/84059479006.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/biqgko9cqvsf31jsqu104pquk6/88051304009.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/07b74597cb6e2af8a9b29bda1c5be23d/sudox.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8217ac9ae14aba3a39fe737c2d45d36e/64020039416.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2ba63d67040b4a40523b8a2a4b05ca56/72933366774.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/93117605043.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/davibonizedunilejavuserus.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a1c016fec12dfc38df0ab5909e9d0120/vetabaxomamuderaw.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kajararojosawam.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/jilawudofuzewo.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb1add59d1---91734004831.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 18520 bytes
SHA-256: e85d51a12da70576dfb008de4ef1c611783916a5b7778617ca9732857399016a
font_01_sfnt_off00012a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A1 11288 bytes
SHA-256: ee7fa86de1296da8c177846ba1573546e970e1e899b33bd90e6a3f72923143d9

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