Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cdb7a8f82e775c…

MALICIOUS

PDF

103.7 KB Created: 2021-06-27 03:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de06691713da32f117bdd1b34da20b31 SHA-1: 29e9fe9e08012f01fb1c38f269f463edcd31c0d4 SHA-256: 26cdb7a8f82e775c8e00c1a526fa115f5b8cbe1ebcf42d34de407207ba2d8739
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://asea-admin.com/_userfiles/file/20210621014320.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607592709679e---9664182269.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743eb7c970f---dixogapumasabawa.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/68e0e6ddf220ede71d2ca6744407fd21/misaxeki.pdf
    • http://cortabellanews.com/userimages/64628299738.pdf
    • http://abpaluso.com/upload/file/nafubiluforawut.pdf
    • http://skrabl.pl/www/rpbd/fck/file/62882626763.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/97e2cc063bf6f4eaeb4d214fd0ee54d0/somegezoxugarokoguda.pdf
    • http://hzjksj.com/images/upload/File/kabupexa.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee60f065b4---timinibawitozusotizata.pdf
    • http://i-daa-wl.de/userfiles/paruradosodiletukopunas.pdf
    • http://fine-cottage.ru/userfiles/files/34893140257.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075807c48a90---5911137003.pdf
    • https://ev-owners.jp/userfiles//files/88701618989.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/86770477111.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rmsnu0idq2mqqo3lhmbh0ukfpk/80566719640.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c755a8bf15---gusefodedalivosufege.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881846807c8---nuloxadowebofapigogi.pdf
    • https://alexandrapanayotou.com/web/images/static/file/3833993423.pdf
    • http://rainbowcaterers.in/userfiles/file/21390240249.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097043894b6a---79756921510.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8ae6ef701778f38e870f9c854fc23c81/69274951845.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/823ff087bffd5a043bdd0928052049e0/lojurosovasodiguzafo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=drinking+warm+water+in+the+morning
    • 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_off00013166.bin
3846a843038e43b6f8ebc91634053395b844f6429e591c279f24ad9d1e9be7e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13166 18004 bytes
font_01_sfnt_off00016006.bin
f08b4b62d167b8f24e8c7f0fcc6d3093f5fc52ebbbf6b0566b2806f20143dfbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x16006 10520 bytes
font_02_sfnt_off000177d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x177D7 16792 bytes