Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d55ec9354926eef…

MALICIOUS

PDF

84.9 KB Created: 2021-07-02 07:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17c7f0839675215df614bbe941971726 SHA-1: a03075f1d4e9fda04d2d47cb42fe869c6f740c29 SHA-256: 2d55ec9354926eef2da5ec84488e8099420c5aae7a15756182759d09019bf76d
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and contains heuristics indicating a browser extension installation lure. This suggests a social engineering tactic to trick users into downloading and executing malicious content. The embedded URLs point to compromised WordPress sites, likely serving as a distribution point for the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/69013906016e51c246b54892c5743692/39917580002.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1d694329---fogajiporuzibeputotukuj.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd53a6e84---votumokevazav.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/9145478828.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160810a9cf300e---zuliva.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160c708f2384da---79133776714.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/nsu66kqk2fdao2u2mr9qtkrdvv/jutaxefurejelotusimosup.pdf
    • http://sys-svinding.dk/userfiles/file/9114556688.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91ed1d8115---55908113926.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b15294869eb---37695188108.pdf
    • https://alutat.com/data/file/8084768371.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7b87db33c8a01bf42a12a50c50d93328/40657137365.pdf
    • http://unityproductions.com/upload/files/bififesixumulatexosepese.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/79175105431.pdf
    • http://parbatsamajjapan.com/img/files/files/konogotinag.pdf
    • http://transinfosoft.com/userfiles/file/rusavalegamatagib.pdf
    • http://lateonsettay-sachs.org/userfiles/file/nikelogukadekez.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b1941ecdb---78969546761.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/20223349867.pdf
    • https://egf.tw/test2/images/file/natov.pdf
    • http://mextro.de/upload/files/wuzodilulakozonex.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a42275b1370---sumaxedo.pdf
    • https://bazab.ru/ckfinder/userfiles/files/lesejimufoferadagak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=h264+to+mp4+converter+online
    • 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_off0000e954.bin
4bdab49ecfebf3e8afb9e5d0dfbf7e3ad9ae8f870277eb6a75b2030c3e8c0791
pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 17088 bytes
font_01_sfnt_off000115f6.bin
e7175b84f8a0115c4d53c625753b6bb5f5d1d068a9cfc72f278e674e4b00739d
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F6 10628 bytes
font_02_sfnt_off00012e45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E45 16792 bytes