Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4a0c1d25a43902…

MALICIOUS

PDF

83.7 KB Created: 2021-07-15 21:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b8683b0c44ef02f3c5daaa155dc9e62 SHA-1: 9597f3be089aaad669b400914a475a4e4888f985 SHA-256: 2c4a0c1d25a4390222847f45e1b92e891360b02310cf5f1f46aced81868a658d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam. It contains numerous links to external PDFs hosted on compromised websites, suggesting a phishing or credential harvesting attempt. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the heuristics strongly indicate a lure for financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/wiluvomapabimo.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b76209dcf3054663e219760987a24c80/dogonita.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/08911879d78f40da58a91348e0932c38/wuzixug.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813755107a7---xonunonod.pdf
    • http://booklandbooks.com/userfiles/file/femikepozegodinibim.pdf
    • http://georgewongdesign.com/gwd/upload/files/69592519284.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/1fdb6ab9bcb1a482f86533b232a219ea/tejifezik.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/4n39ckhvrqurdjuhan9ataaahl/7152794766.pdf
    • http://lumieretvie.com/userfiles/file/16466678451.pdf
    • https://radmangroup-ye.com/rgfiles/file/52195931177.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073003653351---pediwi.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc673d5c56---tudejogitez.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/906f8010c0a1a862dce9f9ce2583e5f9/fukizibinirigoxuk.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/tizarujajotivozit.pdf
    • http://congluc.com/upload/files/mejalelukedamejoxofu.pdf
    • http://sushiloverca.com/uploads/files/23697381340.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160af5d3c3b32a---97761913106.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/0c3f295e0da6d7965183ff83c9d4fc35/fiwefob.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af7ea90a07---noxixosetevupebokuvolubi.pdf
    • http://akinmedical.com/uploads/file/ziwudokijupi.pdf
    • http://coming-c.com/userfiles/file/40935427630.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=local+tennis+players
    • 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_off0000e611.bin
2991961a769c4417b1765aa9ee8d4f3afc9425e55f8c9ca841499d22e587aeea
pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 16844 bytes
font_01_sfnt_off00011205.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 16792 bytes
font_02_sfnt_off00012a1c.bin
12b46421ada5a8a28cd48058136428d5d9281c9f76086dbee7589baff5090aad
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1C 10436 bytes