Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd8c5676f290ae9…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 21:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a902a5637160dde38d603a98ab7c07f0 SHA-1: 918495765b010e69609fee6fae56457b24118efd SHA-256: 6fd8c5676f290ae94b47951c275d6a717dcdf5321814a861cfb84fa08c6eff8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF-specific heuristics related to external URIs and link farms reinforces the conclusion that this document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://homeopathyhk.com/files/75078779895.pdf In PDF document text
    • https://ngusacdon.com/upload/files/giwopimuwinogemaxotajupo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e87d1d1879---xizoriwobe.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210904195227.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/74057392721.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/bajofeje.pdfIn PDF document text
    • http://rc-modeller.se/images/file///voxukibewusi.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/6915870178.pdfIn PDF document text
    • https://ghnservizi.com/file/ruparojesexunudeful.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/2236589901.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/25466300057.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/sofejoxalizolo.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/8720604608.pdfIn PDF document text
    • http://hidramaco.com/files/files/deluv.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/21816445250.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/46389823109.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/82532706650.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/totarofalal.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/sadagusuzorimokukowu.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/sebejuzowepafezokinoja.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/xomixuwijisi.pdfIn PDF document text
    • https://tele-video.ru/upload/files/62160627033.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c519b2070f---vofokuwarititawoxuzate.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/60095327002.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161369225147ea---94613395874.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/70461589405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+install+android+studio+bundlePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC15 10560 bytes
SHA-256: 13ac08bf11fad50dcaac90c4fccd50879967d4eeaf37a2f27f734879e5e984e4
font_02_sfnt_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 15136 bytes
SHA-256: f7a46c3807aff7413f29c0191824a8c34835d321b0e14463ebe82be6f58d326e