Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f50ffe16915e26…

MALICIOUS

PDF

97.5 KB Created: 2021-08-24 22:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ff37c53742e8b738f9e5edd00c1a71b SHA-1: 110e9f557f38247142713a65ac3ce95bd4067358 SHA-256: e0f50ffe16915e267b5920b53b4a7511ce274e33ba02a7f5658f25f6e78687d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aqbnb.com/uploadfile/file/30492735025.pdf In PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f95e1dd20---5622083581.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/taripotog.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/voxemazafepizinabojuxamom.pdfIn PDF document text
    • http://cci100.com/clients/57496/File/gatalurubajegoxeduxel.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/pimumabimogepigijemu.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/tapuzilogusuferivudabafaw.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e6469785b500b12417cc57a6e667d90/kufefavobilunisosunenasop.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607022ca32321---32112570807.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/24345427249.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4dc815435---damotutulos.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e10502f40f2---jobup.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/13294824292.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/3702216905.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609141ae43583---rozimizosuzebesovet.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2a43dc67bb44dba60c920bb08e3b48d2/35381231130.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a097621b3---33211376103.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/442473fcd88e183f62f8bd091fd63c3d/99184508922.pdfIn PDF document text
    • https://webmenuplus.com/images/file/pukor.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/12316054651.pdfIn PDF document text
    • http://specimport.by/files/files/24343615984.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/d3eb2b56ac9d702fff3aa1e96c3a4528/budiserebiwat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=meaning+of+molalityPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00013f35.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13F35 18728 bytes
SHA-256: 9047b3e8bac0202f68050e4c638dee5aab5db05c8942bb43eec49e926160023d
font_00_sfnt_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 26064 bytes
SHA-256: 531b4dc06b1be574d0d3e24c48bc6bb6d434495de71fd7d7dab61605c0326209
font_01_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 5256 bytes
SHA-256: dbb50f84bd6ef07208592b6b48ffdba37259cebd40d2650970aa31c6d1efb9fd
font_04_sfnt_off00015e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E30 10396 bytes
SHA-256: 27568d7b792d52c1fef520595adcfb151e2f672f3fa2bcbb2522a2302b0f55d6

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