Malicious PDF — malware analysis report

Static analysis result for SHA-256 a498ac6299653353…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 06:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4744cf033a883222b69e1e82029e0f87 SHA-1: 6e1623ddba2eb37e7a9e0a45c5fd69f5edc66484 SHA-256: a498ac6299653353d845cae7eb2019bbbde431bc9bcd8b23763a47565c3661a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2fb9fc0075486968003403f266a8406f/wosovowujiwukalanejov.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16097f1962ed52---28753417310.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd867a24f1a---tabaxajarapalomo.pdf
    • https://prawobrzeze.info/userfiles/file/wokuvevokigi.pdf
    • https://promise-land.com/upload/file/4598095660.pdf
    • http://perseverance.cyou/updatefiles/file/ruloliwi.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/84ea7a9014f6f78a3d94c31ac6fb6b43/25583896803.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/nunubuxe.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a061d1e7---76912187067.pdf
    • http://parzenica-bialka.pl/userfiles/files/29962885300.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56cb61f284---palexinorafubonexetinuw.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5cfcb2f66---63998504995.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/fofuwalekevafokataloj.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606eadd22f409---83496370704.pdf
    • http://fiumaradelsossio.it/userfiles/files/guzonazogexe.pdf
    • http://maskaevlawyer.ru/userfiles/file/livivuboxolarolomasaxudim.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/0a94c7ce0164a8e4b470b5e577330f32/xuparaxubukosisuloxa.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/35150698427.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hv6e9vvbtgdrbm71nfsh52acij/9860347661.pdf
    • http://asupuro.com/user_data/image//file/zigov.pdf
    • http://lingeriedediva.com/UploadFile/file/2021081503565573499.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=crown+of+thorns+plant+meaning
    • http://s292376414.onlinehome.fr/datas/imgmail/file/bofitonovexawovesara.pdf
    • 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_off0000b90a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB90A 16792 bytes
font_01_sfnt_off0000d11c.bin
5b82d011f10ec15f69924dc14e4d215be95caa09b5b3b1a53678612ff851ceee
pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 15668 bytes
font_02_sfnt_off0000f783.bin
a94933b5765f36808257f8c93be1d593bd05b53957de642360aa953a2abdd6bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 10924 bytes