Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cff93d1b219665…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 02:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 62e4d112ea0a697c2e141ef32a152c5f SHA-1: a31817325712437cae2042a2baa35dbcb517fb13 SHA-256: 10cff93d1b2196655a73f7febc2158d666e837b678eeac92d6604cff933b578a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating it likely contains an exploit. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document attempts to trick the user into installing a malicious browser extension or update. While no scripts were directly extracted, the PDF structure and embedded URLs point to a phishing or malware distribution scheme, likely involving a second-stage download from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://ck-tct.ru/userfiles/file/jivetewet.pdf In PDF document text
    • https://alteanetworks.fr/img/file/37840650360.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133eea35ab7d---81674692801.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43298577035.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210913_0C78EBF38C97EB72.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/texagikitigu.pdfIn PDF document text
    • https://tomas-music.com/contents/files/62286012971.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/61873313675.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/96649238209.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/rujibazapexonubir.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/dqj76g0sl8npe1010206nvsusi/2698364840.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/36915960658.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109130200052776.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/surajakarofigupinuvitizof.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135face731e1---zanizobajonagol.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/jemerukejedojamexexisis.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/misoxupuduponexo.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/mafaniwijuge.pdfIn PDF document text
    • https://majubesar.info/contents/files/pojuniv.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/70137072036.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/37386653959.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/pt9sekrat2gsamak4126utvkl6/vabawed.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/c3q6l691fu5avggcnjtlcoc8uu/lenipupid.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/23237172419.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/37187390458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+switch+information+from+android+to+iphonePDF 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_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 16720 bytes
SHA-256: bd8823ef43ca50e49d7ea2a01145590a47f07bba9d99a6e390179586fd5bb6bc
font_01_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 10916 bytes
SHA-256: 091bb8e83e000dd76e6285c5755e0e0dfe03d33650b15666344776e3a1043032

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