Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b2cd8b8146ee5e…

MALICIOUS

PDF

90.1 KB Created: 2021-07-05 19:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cff3c20909e6e46c748db71bc0228cd0 SHA-1: 42ac8bd023402e1f23fc06cc4a79c27f430cdf42 SHA-256: b1b2cd8b8146ee5e3ddc0c743de831c33c369a42b7ba52af747e0957f7be0c22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress installations or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19fe728ad---94852734466.pdf
    • http://woorymart.com/userData/board/file/7705289633.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/jazojufowero.pdf
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/9561476344.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22c122dc14---77091009368.pdf
    • https://xo-sound.ru/userfiles/file/96879519682.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/tridcttcoa5hn4u2krlo8hlu07/kifusakeruzogunapa.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e111ab5d6---velikegowonarabanup.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/frkiv2u9ksl1djmrvejb8i1nf2/sesusogimolamojakef.pdf
    • http://www.jindatunnel.com/up_files/file/50353733921.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/5b533d19efd16233a96277fa552418e8/37923835659.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089b6520e1ff---57246432016.pdf
    • http://www.rannatennis.ee/data/upfiles/files/2487348152.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/58075528507.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d054db3e6d---10656099544.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1f20c453575fe9167890debf7ca4bcfc/gorilarisakurutulalas.pdf
    • http://dui-antidote.net/images/userfiles/file/fifutarixetikixavami.pdf
    • http://dmkaudit.sk/101/upload/file/mibudajitepo.pdf
    • https://hagepoorter.be/files/files/nixugejokigojonojovuvuzus.pdf
    • https://castel.ro/userfiles/file/xedofopuxam.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4b96de4ddca70146d7af4a52a30b44f4/2599472161.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f35a624e---85616045144.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j1jnil2t870k7qbgh1bqqms1q7/93217483584.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/b5da29n58pklrs1bd851ciuetn/zisiwatik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=widney+gas+fire+instructions
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e9.bin
5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 16344 bytes
font_01_sfnt_off0000fde2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 16792 bytes
font_02_sfnt_off000115f4.bin
3780800e859bf4f649d08af6a28da728e17f0b579f3189ae876a9be768b4f8d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 16852 bytes
font_03_sfnt_off000141b1.bin
adf519b470aa9f7eca916355467282a81c7df78459588d5b8ca5ec9b80f82cbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x141B1 10812 bytes