Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b83b5abacf5169…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 12:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 246372541af4c4e0413f9237e9977d35 SHA-1: 94c56eb8dcb31251c92e4ce441b0804e08de6b1d SHA-256: c7b83b5abacf51690fd93f9ca280351517fb3433db0a62a71a668477d25e939d
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for SEO manipulation or distributing malware. The presence of a 'SE_LOLBIN_RUN_COMMAND' heuristic firing suggests potential command execution, and the ML classifier strongly indicates malicious intent. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://shop-exclusive.cz/userfiles/file/dezesiremegavatokoz.pdf In PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/rubokiwavotezovoj.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/nezatiwitupukid.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/40069739332.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/55377275346.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/fovesapar.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/jaxumozigipamado.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/zutemenaz.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/jijuvudojosovifulivuz.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/bikenavifenis.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/68695556996.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/mareni.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62536194253.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/37198432800.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/58273892462.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddaea3b2bd---zipebuwukofevenorukuro.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/on6s204e6a4dnvbcbp3e49vlc2/94629536714.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/nediliwadawexurona.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/79647344322.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/jemupoledabax.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/11/56702862460.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090105534828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+trace+a+cell+phone+number+using+cmdPDF 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_off0000d9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 17476 bytes
SHA-256: d0bbe2d632cc93a760b9006d16f14775e34b647729d1a8ac4ce68aeb9765134e
font_01_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 11276 bytes
SHA-256: 24e23cbf656120e8567c21efd7538fe28ca8177585976747b57aa9cbbbfa682d
font_02_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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