Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba41c9a9f3826ca3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 06:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d30a02ad812e6f7a97eb4dd76507fc7 SHA-1: 1997377abcf2846fb5ec56c12d029b271e601fe8 SHA-256: ba41c9a9f3826ca36ca50528112899e6f808b2940a9d53380e9db4e545d8dfac
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=free+ebook+library+pdf+download PDF link annotation
    • http://westernstudioservice.com/admin/userfiles/file/tilamedeluf.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e1c357e4c---votuxexumumafuvutape.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/bifozewijoribeletem.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144b784acfae---23961000643.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/91488132664.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6221bb6a---likiniz.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fbbde9d16b5fc8907339f13fef1da0eb/gorebijelezivunilusasa.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/zizujiwudejoje.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/35518952828.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/71201788905.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/jewidikejixutetejanepese.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/zaxagotakijuzixifafizorus.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/rerojuxofujigategotutik.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/rorojujoguzavepininedef.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613125afa9109---96532483023.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/37441694928.pdfIn PDF document text
    • https://stopserv.ru/files/file/bofezarodakedovedode.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/62763445332.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/5335721209.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/lirukefimematafadevuvu.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/ziwititorimokirisa.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/pomav.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/27831341791.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/1084978949.pdfIn PDF document text
    • 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_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 17304 bytes
SHA-256: b145dae286af9b46ae26a8eb1ed9459b8700b8e973d50b239483d2db7a227877
font_02_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 10632 bytes
SHA-256: 37196d690a62aba45f783df5e5e8372861a96efbc32cc85b44c8c382a1d2aa96

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