Malicious PDF — malware analysis report

Static analysis result for SHA-256 b367174d78fda33a…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 14:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e38b5dad41c14927dfed4900e1c5155b SHA-1: b4af77695fee00d305c8677d3a5b0e341bbbe772 SHA-256: b367174d78fda33ab0ffa09806c6661f9648c72b189839359925cd835c7c1d91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous links pointing to compromised CMS upload directories and disposable hosting. These links likely serve to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.channeloflove.com/ckfinder/userfiles/files/kileweronogopozebow.pdf In PDF document text
    • http://m-s-g.ru/userfiles/files/wivugezebedazudolimug.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/95349353280.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/jujaveluruvok.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/87030590627.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/9d89fc4fdbcc388eead7411b4f9c456f/wuduvobobegujekur.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/29807514860.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/31218437709.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/gujajot.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161386b3082ec5---64159003755.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/17807542652.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/10669345243.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/vuvaxejegusupivamizilak.pdfIn PDF document text
    • https://coevent.ru/upload/files/didin.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/bawavedurut.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210907170001.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/77380727332.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/77420690778.pdfIn PDF document text
    • https://flomogroup.com/upload/files/redulefunadazatebewofu.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/faletenatebesepipajol.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613050d6946a4---32092653927.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210901133248.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/55163987020.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210905115858.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/zusinarageduta.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/13934881284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pragmatism+and+educational+researchPDF 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_off0000bf96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF96 16568 bytes
SHA-256: a6952eee3c810cec7efba577c106d52f4e3e76d54f27130a9c99c1ea4d8e8d5a
font_01_sfnt_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 10920 bytes
SHA-256: 57a78658cd010de4adb6f4f0046a8e60a67fad7738a0e62d005f919499ef5a74
font_02_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1