Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d547b3d5aca488…

MALICIOUS

PDF

89.5 KB Created: 2021-07-03 09:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7390679e9788a59ae639b0d0cdd812d SHA-1: e8814ba34586c0223a631a2a67a2f4a3fa134038 SHA-256: 70d547b3d5aca488e31cc95dbb789790d20d7a85e675e3bec739c81d38f171bd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or malware. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate effort to create a deceptive web presence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=client+server+testing+in+software+testing PDF link annotation
    • https://melz-feu.ru/upload/fisapokedidokaw.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/51639625361.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/pgoc0dttivsg50c3n38fvqj2ea/3415787209.pdfIn PDF document text
    • http://dgjst.com/upfile/file/82794207073.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/vuzikefigid.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/cfafeb48b9b2778f9ab2b9ae70957531/92547783418.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/61592515961.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094b06494dd3---69947425941.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29f527502---26241222349.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/66547572065.pdfIn PDF document text
    • https://jagominum.com/contents//files/suwuponezixexadejixas.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/47078426972.pdfIn PDF document text
    • http://ruihuitax.com/files/file/6441686337.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/18025202037.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/34520715085.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/bazozamivad.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc3cf1e148---52491996226.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/97583345766.pdfIn PDF document text
    • http://abroadster.com/files/nufogevix.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ddbd0e834---35564509917.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8505e6ef9d---11301299260.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf4b24e927---xuvubimafidap.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_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 17332 bytes
SHA-256: 8b9b4346ba8f9759e0a965a7b9add95ab47d56f95b4e5f49547a663298cb8a4b
font_01_sfnt_off00012823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001403a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403A 10572 bytes
SHA-256: f07563edd779347983f52c96098d7adcb126f356852ce4f295be4856cc620d69

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