Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b17d9d97472766…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 23:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6425ea5b9c0c95adfa80e550fefe9b1c SHA-1: 20bf4f0e2ffe1524c8db65f6f87d08d343618a7e SHA-256: c7b17d9d9747276647237b436a5d99908a2c1d07dea9cdfbfab01ca269713922
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous other PDF documents hosted on various domains, many of which are flagged as unknown or potentially compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://asavn.vn/uploads/userfiles/files/zokulajuxoje.pdf In PDF document text
    • http://cbgnfinance.com/userfiles/file/kisiv.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210510135721.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/72605319232.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/zasadezadixabok.pdfIn PDF document text
    • https://maymac.info/userfiles/file/53577353808.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af69d057390---27000834070.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/72529717380.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/gitomupemidasazufujuxigol.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/fonil.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612812bfc519c---temejusajodotam.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/735e864dbf8a973b20b889d4688311f8/vozuwopesenevidadej.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/sofajegawarex.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/9403933665.pdfIn PDF document text
    • https://argumentua.com/i/file/91692191126.pdfIn PDF document text
    • http://houselandia.ru/files/87418652112.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/tuxesurut.pdfIn PDF document text
    • http://specimport.by/files/files/bisiremamuzikuwu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/933783395.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/kotovipafifozozanofilogif.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/80290228525.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/63184737380.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/miduziwe.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/xekapigexolupavoxajivifo.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/96875004770.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108a65d84d72---kezorazamuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pdfbox+create+pdf+from+templatePDF 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_off0000dc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 10660 bytes
SHA-256: 0ecc6e6eb7223c6a6368916c812e804b1ed5622438e04b74cef616f459620114
font_02_sfnt_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 17604 bytes
SHA-256: 22dcaf8bba8850bb2cd3822c71afada3cb58b816e6b4753b39dc576305f345f7

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