Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8878bdbad2e2b5…

MALICIOUS

PDF

74.5 KB Created: 2021-06-28 23:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c1d34a3bb8c462b44b7095dd4c8ed1f SHA-1: 785e22db275e9dfa9b5cccc663c4c8b027d5da70 SHA-256: 6b8878bdbad2e2b51dda4ccae0b431b66611efec43c0b34767f24f66212ecd2f
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing lure. The PDF's structure and the presence of external links suggest it is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://worthingtonpark101.com/userimages/susaxuwekenirusodazazas.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf7803415---92082919335.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b753984b52e---14433611613.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/30381347083.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160baf8a04d8b9---metupikeje.pdf
    • https://atraba-holding.com/userfiles/file/18586648635.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/f27f83bc05b761036699de2c482735a3/muvodo.pdf
    • http://elcampoeco.org/FCKeditor/file/soniwinotetobobelo.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607210648bc2a---82727227669.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91b8da6c2---60080933243.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2f11067bf---99430360858.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5t92prl74lno5gojr17k1gvg7d/76065649459.pdf
    • https://facades-et-traditions.com/actualites/file/jokugavotafup.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd0ba2d0a---dibivesov.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076593226863---jajotu.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbef3f9e9---vonefibavojeni.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/05dgshaskfmm7hqskds25c4vnp/nujuv.pdf
    • https://soalmatematik.com/userfiles/file/nusogafipowazakozalolino.pdf
    • https://0900107678.com/upload/file/tupeno.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/nimelixazajosivew.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2f91fdf6---35101822066.pdf
    • http://ghalemdi.com/userfiles/file/84371948509.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/4490577377.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/lulunamo.pdf
    • http://tunesistudio.eu/userfiles/files/74922409836.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f645fa0e83---15167475489.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+father+2020+torrent
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c288.bin
7742eb2cd08430484f7604bfff8a5b6b02828005cf9a6b4b461e893c23702480
pdf-font-stream PDF embedded font (sfnt) at offset 0xC288 16140 bytes
font_01_sfnt_off0000ec4b.bin
487367b68bdc4b76b81a1b022f26607d24107411ae8eb5bbf6d0fb7ac1d02b34
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 10208 bytes
font_02_sfnt_off00010334.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 16792 bytes