Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c41c112ea61787…

MALICIOUS

PDF

112.3 KB Created: 2021-09-08 08:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb5fc3098d2dadc467696afff2b2157f SHA-1: 7d95288ff138f4eaea85c2041b8ecc13b5e27b32 SHA-256: f6c41c112ea617872315c4e8cfec48efa7115b07d2cd7c1fb9f86862036a51b6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate that the PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7e91c07d---nexexipekezujebuwatupu.pdf In PDF document text
    • https://medtek.vn/storage/file/nopivanoredidaxu.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/vafup.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e273fbe1a49---fenakexuneduvitezewiliver.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da68b045825---92915944430.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/demorawuvivovikojexaz.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/duravilenav.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a947c56d32f---92732547278.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/40262069165.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210613174559_uzgipw.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/92629858058.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e662f029cd---movizinibetumu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0a6bbd1ec---74406645762.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/87023109605.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/caf8d8d8740e4cf33133b86ab8d4524b/jugozaganusokoze.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/47425454690.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/73736534542.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac685af92---panukerutememafitero.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e224af2d52f---kagetale.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/lukaxalabiwezozep.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e24e8b31e22---simavojitavad.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/164d719e2f828657524e70ba2676f302/nerata.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e415c1e5eac2cb344218abf435e0edd3/fawajonebewi.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/354156a4185ad8eb814736f02d9b5044/nexenuruja.pdfIn PDF document text
    • https://eurotig.ro/file/51573106241.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/6igctkf0519usg2mppa6e1vv9f/nosilipenizorigatetasikit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=wizard+earthsea+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_off0001528f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528F 19008 bytes
SHA-256: f8c91e9ba6b614ce957e174cf2c1ee8ba42dac711986bf908f4fb5ffdb2561a6
font_01_sfnt_off000183d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D1 10380 bytes
SHA-256: 16733f85b602a81e650a49355641fbcaeab40311292818fafb818eeb16724c7d
font_02_sfnt_off00019b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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