Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ccdeb4bdbdb505…

MALICIOUS

PDF

72.2 KB Created: 2021-09-09 19:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e0b6e34f7e1c1eb9250716c961749b8 SHA-1: f3f0547d35fe45548e40f56f6378144916e82ede SHA-256: 06ccdeb4bdbdb505f1d99cef98304b2063aa7dd8a79acebbf33dc9870bcfd8a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://slstudio.it/userfiles/files/kamalojezaxu.pdf
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/xiwosexejozon.pdf
    • https://sibservis.com/ckfinder/userfiles/files/fesemevovafopiwusas.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/mitapiminorasiger.pdf
    • https://torgradio.ru/new/files/file/varenuromegifalenasoruvog.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ed644f66b236a02adf9c7638a1c1ac0c/85151279599.pdf
    • http://saiprogetti.net/userfiles/files/mosanogopopagijatuwegat.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc037bc4c---67188190940.pdf
    • https://hazeloyun.com/calisma2/files/uploads/xigamijikepubajem.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/kofepuvugogopiruvaruzad.pdf
    • http://thietbikhachsanvinhhung1.com/upload/files/27998038730.pdf
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/gasolulabalivemixivik.pdf
    • http://sarigol.kr/userData/ebizro_board/file/xewowasazakeradiba.pdf
    • https://5a.ro/ckfinder/userfiles/files/86231359623.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/e650d7b7b0e58906cbc9b86345bd2c70/jitij.pdf
    • http://pelesiuvalymas.lt/i/File/36389526798.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/oad92p4khhh5nreshiefekopjl/gilixeguxuladum.pdf
    • http://abwcolley.com/uploads/files/59599883782.pdf
    • https://lombardpruszkow.pl/local/userfiles/file/pinelizadatopedow.pdf
    • http://thaide.org/userfiles/file/fopujisiz.pdf
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sivamodizosovapikapemu.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8535f2c6f---solitekurov.pdf
    • http://szjwwj.com/userfiles/file///menov.pdf
    • https://audreyheselmans.com/_files/file/68371237562.pdf
    • http://exdebt.bg/userfiles/file/5928095536.pdf
    • http://bhartiyambeohari.in/userfiles/file/novamezanebutuxoxoz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=1984+free+ebook
    • 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_off0000bb20.bin
494393112436ee2b29d849ef49f73b3eeff0b20ffae612880083e9ac7cd1f1be
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB20 15968 bytes
font_01_sfnt_off0000e41b.bin
e816796f4118d2b3a65197d52fa2e4fc738b1183b903d7a9cd0505664f72bdca
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 10180 bytes
font_02_sfnt_off0000fb1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 16792 bytes