Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c7a2ca5f62f83f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 07:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93b9b03347559995e64d93f1355a8f08 SHA-1: d00634efd0b605cdf81de7e1db1c1fe8e81151a3 SHA-256: c2c7a2ca5f62f83f09f9be85919c136d9c41e77bfe34c159acb17455ec3f48af
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092076debae1---zonobak.pdf In PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/49cc9031763d774f9f0c983700d3978f/jipodokaruxut.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/rifujadawoka.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/juduvumudofob.pdfIn PDF document text
    • http://108homed.com/userfiles/files/47929269582.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d242d681a80---nubenivetasexe.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/97939346018.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cf8229e56ef6b1555a56edbe30e03422/bivezobobuxurug.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0cff3286e4823b31a4a14b0e1f0c6fd5/notutezuwoz.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/xekiwegupomori.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/9894134640.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/18110603544.pdfIn PDF document text
    • https://chpcentre.com/files/file/fikuxatileninesagageguf.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f03754c4389670dbed324e55782dab8f/wutexuzedurizegu.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/86173803808.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/21649505267.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/bumolorori.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8da7fa0dd3---87355514344.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/9rhbr41p1usob7rium27sbb7mb/jexapon.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23834361613.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/82885861268.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/80079186413.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210716215604148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=principles+of+organization+management+pdfPDF 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_off0000d26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 15920 bytes
SHA-256: 79fcf4333937b280b9cd45c46cea1d81379d451f2e0ef19d0d658d7258954506
font_02_sfnt_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 11024 bytes
SHA-256: d685827703bce077f42e77ee1bbe23cfb5eef6fd7b3c22a584fcbec6515f744d

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