Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3da7854c02f797…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 18:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae493c11d7fe838d81b5f17e754e0246 SHA-1: 186b5661313f9e586cf84b13d7d387231313ed58 SHA-256: 8b3da7854c02f797ed193a389e5d2854a897eef64013b015e343f3d96355a088
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://greenglobepms.com/uploads/wurupedaxawulebe.pdf In PDF document text
    • https://mimpishio1bet.net/contents/files/viravowaditonu.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/14508210814.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b1765099d---gepuzag.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/31960803739.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/lorijovokegizogumujevu.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/pokonilovututo.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/kimebuwunopozox.pdfIn PDF document text
    • http://khocabien.com/uploads/files/zibazifurodurukupapujuto.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/71207281221.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/lufitibenenefupuvosifugi.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/86669453105.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/sadapijidukikadaboret.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/79843260957.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373901e9fdf---55327137193.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4d365ae3---14352717146.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/fenakefidewenetubu.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/lukiv.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/13023104567.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/81579510255.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jokononelikusozirogewekes.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/luwufitewosorolem.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd0009d6b4---11783124671.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/jemazoverabalerijojuxaze.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/wonaxori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wireshark+download+for+android+phonePDF 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_off0000d2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 10668 bytes
SHA-256: 13da88356c9e2c9674a87a448defaa10b8175664d00a9795c29723783ec138f4
font_01_sfnt_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 17664 bytes
SHA-256: f1e7b0afbdf020607a1348e2bab7fc6cbfd710506eb71a252f31f080fc14e48a