Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41f7d51d04dc9bd…

MALICIOUS

PDF

88.6 KB Created: 2021-08-20 22:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3e3285ef115a3fa59f4c16d01578b94 SHA-1: 94226161ca71e5a652738d281755981907f50a0c SHA-256: a41f7d51d04dc9bd99f4884af49eb337403b16663c78ffae6a0d1e497ebe4e60
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further exploitation or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=medical+evaluation+form+pdf PDF link annotation
    • http://beerskiboot.de/img/upload/file/sakibexuroda.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zofedunizivefubofu.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/54896899655.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/89808918346.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aaa3d6e0d---vanotozuzadagosuvimobule.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/78424386394.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/19260625283.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/vipixaxikejarumujaf.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609280f05c0bc---94500142132.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787268bb621---64099785389.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a001fa6c65d---84926868992.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/pevanizowivutabi.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/95a613f028da2217fff8c4ea2e0bce5a/15613138758.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/63402508997.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/53093541299.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee69757815---kojefanilegobusu.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/komuvesiwarilefijegew.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c091008bc29---16307315122.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50374e4cd---siburoxedakowaridu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d776ece0a6---42211752701.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/vozovaperovivafep.pdfIn PDF document text
    • https://makenie.com/upload/files/95691113257.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/58832624611.pdfIn PDF document text
    • https://geniodelweb.com/file/56547458019.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 16088 bytes
SHA-256: 21ff46de98f0902b53a5c0c946916a1dd4551bbaa4204463728281c4bc54dda8
font_02_sfnt_off00010ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBF 16360 bytes
SHA-256: d449ec54d53f896feaf398a65d0626c569b995fab6249d1659698a5efb14d126
font_03_sfnt_off0001394a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394A 10772 bytes
SHA-256: 56224b95fa12070929dbaa2ed79fe1ac763e343bf3a58f5566f23a1b0ec290bd

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