Malicious PDF — malware analysis report

Static analysis result for SHA-256 0632a114e76ddae2…

MALICIOUS

PDF

91.6 KB Created: 2021-07-18 00:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2fa08f4653d45ea08bde75a60f47038b SHA-1: 48f822090d6d434bf0bd868c8db0ae450cd759c1 SHA-256: 0632a114e76ddae267ba4b46d48343b15926cddfee3f448fe7bde6784b51d906
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6adc43cf4a081855a34087639dbfa5d9/xawaxefopani.pdf In PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ed81d5be32d9ee81a0b225bcdbfef653/97512395693.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607930accb087---63553558655.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/55608804489.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/21524252280.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/wosute.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/8479496061.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/lezaxajokixuxinorodomo.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/74787017944.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c34e9c7e28f---jasinamasivoxagavubip.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/55440018547.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9718dbc06---febazopawuwimofe.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a559278441f---wadobenuwupinenumenodifa.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/k61l3tmjvr00ac5f2u0rk34o1k/rekitodaduxapenodo.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/siwugizemepazude.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/19230809647.pdfIn PDF document text
    • https://advik.net/userfiles/file/jemixofupidemu.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072c74a753d1---14963442470.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/42978617175.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160913fa3bb59a---73635960313.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6ac8709b973a3f786bc0f5e11cf68f1e/90782991981.pdfIn PDF document text
    • http://dgjst.com/upfile/file/diluxapej.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608097f40078d---44248634111.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160833b2808cb9---51971025959.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085685c61969---34571405003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=on+the+offingPDF 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
font_00_sfnt_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 21196 bytes
SHA-256: 2b3a952d9cd4a6675d44c72e4931392565ca1008009c4814c151a1d4bd7ae6f8
font_01_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A7 10040 bytes
SHA-256: 9d4a3c38a30f4f2788e5586753f56a2d04829079e2307dfa8141a78116a0cc07
font_03_sfnt_off00013fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE8 2056 bytes
SHA-256: 3301bf96b1e265110aefcd16375fac31fb586a0fdc083ae99a983c9a886e1fe0
font_04_sfnt_off0001494f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494F 16240 bytes
SHA-256: 255de0e36ed676796d1c6817bc1303e4de77d81ea12fbb8e499ed0650c30a4a6

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