Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fd94500e3291ee…

MALICIOUS

PDF

88.4 KB Created: 2021-07-15 16:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 754d20d142ef6748a1a59621226c665d SHA-1: 0ad1e749087769385a77a4c822775ac64e8d3c5d SHA-256: f5fd94500e3291ee29a65eba04de4f3b1df6add25a4950a2d707681267f0d25a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm pointing to compromised WordPress uploads and potentially a callback phishing lure. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or scamming purposes. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/r5q5k3qc36bi1307o0t75afqhm/21157400702.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/vonemafumeruk.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee265691e6d---soxixunikapufokokenige.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/72b1015c02b69a2825b734aea9441be5/nupuverev.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddfdd1c2b5---kuponugu.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3863e2544a960eb8ef3a80422af42e7d/82014401179.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e589c5e85ff---42651098353.pdf
    • https://davidfoleyinc.com/userfiles/file/lavide.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a5964fdb---59916033645.pdf
    • https://mednet.mk/public_html/upload/userfiles/file/61709553462.pdf
    • https://carrieres-pierre.com/userfiles/file/66788100772.pdf
    • http://ccswcd.com/userfiles/file/82379523648.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9c5ddd988---52805034890.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/d4a1b7c348819bec8b2cd9847e6a3fbf/63339424838.pdf
    • http://originalcheck.it/public/img_admin/file///67174987217.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/74v60op64atlvmfjddvp5kdo48/21901628324.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6eaece214e---43445813904.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c5df8bf2311---24739396771.pdf
    • https://zlatartopalovic.rs//files/50783875777.pdf
    • http://freetourscadiz.com//ckfinder/userfiles/files/kisama.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a096074c1---tabofububu.pdf
    • http://bobiniauto.com/userfiles/file/76856139676.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/bs01s50210au29fqjivte9tj7n/subusimonerezev.pdf
    • http://dwhs79.com/clients/15834/File/gikomomi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+long+does+a+domestic+violence+conviction+stay+on+your+record
    • 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_off0000f5f5.bin
799dace55ff0f8a0496551d6602b244617ec73054d938135fdddab0e9d4b235d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 16876 bytes
font_01_sfnt_off000121f6.bin
b98212f4099e281208f5352b1b8b3138ecc4be34b718e3248f8b63d62978e174
pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 11072 bytes
font_02_sfnt_off00013b98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B98 16792 bytes