Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d10650ddc42965d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 07:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d692255d36b01012d0fad0ff50525295 SHA-1: 4cbc59243b7140bf9164e911f27fa1bcb3af8f45 SHA-256: 9d10650ddc42965d6744cb780bc2eb0fad097af7c0294f90a7d06ae8f96872ea
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that this document is part of a link farm strategy, likely intended to lure users to malicious sites for phishing or malware downloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/58ukhdvcabrh8rn6b6vj1dh720/23206072216.pdf In PDF document text
    • http://sunrui-ti.com/d/files/baxafegiwulupexiloza.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/zizenuzazetulofevi.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f75e943422---92932552071.pdfIn PDF document text
    • https://aashianarealty.com/file/72686307494.pdfIn PDF document text
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/jemaxejefunax.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/fiwunikimawekubadojukugat.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/t5ahfmg3geb6ni9cd8dtkrudbk/16049059243.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/716429203.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8adb3e08a---kobodakatutekivunusowif.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6f4ee61a0---80520427059.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/3de3c5d08da1ef16ab69142d882d108e/37041051322.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/46053040972.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/kalsv5hpgevake8ufia2cjc6s3/46742124954.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/d6f481d66e8ea6d717abd9318453b82a/69154792784.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5b231aa6ce4165163c5c47c88c996b20/tovotafofutevujejodi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc9d89361a---subowebow.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1f55778f---5385462148.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/wovogusipetutebaw.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/97144819588.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608769e037204---fekamajixofiganifek.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/afd1fa529bb95b0f33bee8c4580d962e/36887049607.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/b4ufrc7nuaceaskf8obgltmd40/xofabubanit.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f45fee9d3d---9500097505.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a606ee1631---59826073929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=efficiency+ratio+analysis+pdfPDF 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_off0000b6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DF 10708 bytes
SHA-256: 27d7400f447293fae2f3e292ce2280fd330055452eebd5dcb2065836225a1c3a
font_01_sfnt_off0000cf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8B 14928 bytes
SHA-256: a5fa8ac9bd3653f2d3754984f727577beed7145f8f8fe6e7cf6fe49c25251c79
font_02_sfnt_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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