Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ce18460ac07d06…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 00:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8e21b90273011bf032d5c35211f5442 SHA-1: 886f1f46e4ddf836a0e64ba5dee0919b734dd252 SHA-256: f5ce18460ac07d065267bb73eaba8328b691af3583a649e01b7d3faad4025093
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links to compromised websites, including WordPress upload directories, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=x+hamster+apk+download
    • http://afghansolar.com/userfiles/file/12367279745.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3422643afe28b96ae8e7d43250f5135c/10756537409.pdf
    • https://ikitellirezistans.com/upload/files/sozovenedafib.pdf
    • https://stiglic.sk/userfiles/file/newevusazinigus.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321cbf30a4f---xikiw.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613854eb66085---kejenekodunep.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387947a24a8---runopotimon.pdf
    • https://csodamalom.hu/files/files/49950313964.pdf
    • https://homestayhoian.thamtuddt.com/uploads/image/files/29488549120.pdf
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59341219812.pdf
    • http://tgtech-auto.com/userfiles/file/22004040108.pdf
    • http://shannonlakeestates.org/fck_images/file/jinezamagenuvi.pdf
    • https://kenhquangcao.vn/uploads/files/zoriwepefejogiwovez.pdf
    • https://liepasmuiza.lv/userfiles/library/83806406456.pdf
    • https://dagvandearchitectuur.be/_files/file/vomelovat.pdf
    • http://linker-apps.com/files/pabusovonuvilirup.pdf
    • http://www.pranabkumar.com/fckimages/file/zanoxogoje.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1e43d16e59dadaea37d35e941f4aad7d/60531193120.pdf
    • http://cnsgawefgl.netsociality.com/upload/files/kopegikemorawonokuwojado.pdf
    • http://namhungholdings.com/uploads/ckfinder/files/daxerenevogujul.pdf
    • http://classicalgardenfountains.com/uplds/file/difiwikejopodivuvivuk.pdf
    • http://bonezi.morefriendship.com/upload/files/kebenamomofeveresojapuva.pdf
    • http://9y.bfage.com/upload/files/20210901141109.pdf
    • http://aucoindeshalles.com/menu/file/lesapiw.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f196a28d68---59575890579.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_off0000d3ab.bin
c45f956438fdf5f1e0feadac23c094bdf2ac4a373394186a4a32746a699e2d24
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 21736 bytes
font_01_sfnt_off00010c5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 16792 bytes
font_02_sfnt_off00012476.bin
2d100f1d64e2a9dae0b45ee11827ec5ef9eb6b57aef7bad67230458a1cf91a0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 10748 bytes