Malicious PDF — malware analysis report

Static analysis result for SHA-256 04da0e4e490ce770…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 21:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cee1865069ab76c2feb1275146d279f7 SHA-1: 000c054e8f2a7718e0f6fff67d9fb4adeb300ea1 SHA-256: 04da0e4e490ce7707822109c1ede6b6b50e70160711209cdb61580a5be969940
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS upload storage, suggesting a link farm or phishing attempt. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160733a6718d60---xexipufoletapepomiwi.pdf In PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/53510886288.pdfIn PDF document text
    • http://scro.ru/pic/file/43337594761.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607e615c1ccaa---37249694959.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/rg3n45sfhah0u9j05ut0s584uq/wekotuvovava.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/50849101960.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/32271773527.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/46842904023.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab05e5c0241---zekefesovawizopariwog.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608285205f485---ledujewoxomilomaw.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/90966827051.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/61399841010.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/perafaliluxoledetixi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d748f38b3---14675304071.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/s7jnihev08j18qgvg2njhn9fu8/femotufelezujux.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/winamozugu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c43b409a01e7484742bccdec5631d74d/vinifagipobaj.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78d6d4c2c---57665461000.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/20032655184.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210625_187D6E48CB47AF69.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f3cbfcbc2fd---90468346036.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/safovabomazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ewon+flexy+205+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 10676 bytes
SHA-256: 08fc8542abb5012f79392040ba0d1b5e4f0e5750388ab5420b6f30b0f385389b
font_02_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 18284 bytes
SHA-256: 81c804b6a0f568f48bcf9ccb9b464a236ad5d14f986461e6d4233822ca9a8d86

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