Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8519e8fd9ecf23e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 03:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00dcde5e5d6c3093a68bfde09d732360 SHA-1: 9522dd93e7d54419e2cf7db06695139385cd11b9 SHA-256: c8519e8fd9ecf23eee9ae34658988754220fca47ade801dc2e9ca3c7b184762a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. These links are likely intended to redirect users to phishing or malware distribution pages, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=basic+environmental+health+yassi+pdf+free+download PDF link annotation
    • https://universal4shipping.net/userfiles/file/61808691177.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/0fru0fsp08un4k5ltpsab342k1/40763788009.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb3842e6a1---3442292460.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/90553586567.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uuph0d882fgm40lncm1d1lekms/doteluxifamazojafu.pdfIn PDF document text
    • http://nessium.net/userfiles/file/pudikawiga.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/wojusuzi.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/37928831039.pdfIn PDF document text
    • https://angkagenap.com/contents//files/tuzunafenuduger.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a14a70d8f---19817105585.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160833ad4b1b32---69518093021.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a703aa00---55037489606.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11bca85bd5---61555836252.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/66138836480.pdfIn PDF document text
    • https://mauspro.net/upload/files/susejo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c139694fcea---52364809512.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16128c7df21068---xixosapigaxovaxufuwitifu.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/26385245786.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/39163687670.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/42402743192.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/xuwunebuli.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/wetazotatebadajol.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/66378e53487006e767bd4f8c173ad7ad/98904291378.pdfIn PDF document text
    • 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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 11204 bytes
SHA-256: 27d714a3e6ab1a566cd1ea2eb35382d7fe81a10aaef09c8aaa7cb028ea2cb744
font_01_sfnt_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 18000 bytes
SHA-256: aedd16b7774ab5ddb82a906b1fef0aa0bbd6bfc4b61bf9962299a9fdb3ea5fdd
font_02_sfnt_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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