Malicious PDF — malware analysis report

Static analysis result for SHA-256 e413e4470c4b23a4…

MALICIOUS

PDF

94.6 KB Created: 2021-07-05 13:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7529005f0fbcdb4132f86f6ca611d85 SHA-1: 21e1054e26232ab423ed8173535f24daf59f6018 SHA-256: e413e4470c4b23a4479269a86545a2789a37fe655446595cdf3e1fba553fcae0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://medvor.ru/uplcv?utm_term=the+expanse+glossary PDF link annotation
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/6f4ad1a6980ee9a0bfe5ca950b366651/wigaxisujedabavev.pdfIn PDF document text
    • http://feg.vn/uploads/files/84997915866.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608122e031baf---54853759019.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/80225355662.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/df84bcfc75cbedf57ffd1888e2458055/pakozinegazowujamakixaz.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d716c5fc---damovunonutizad.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/70549989625.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/15046123655.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/6c9ae1383811e14d9766159a619f88b3/3488858973.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/90358499478.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2aa1925939ac798bef8e04dc464c7ec0/sofuzawavubabatumageguv.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1eedfbb9e947d79a405f9792337f7336/8026548743.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/risuxorufofelenimakedado.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/44054645764.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2dd13257a---nomezukodofexowixu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073b57b563a9---porijevetogukem.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfcb4b8271---40061340123.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aaf63afbd---kawipasozamamipogosotidud.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bfa7f200bced66d6ecb66a6e95b9311a/dikisebejedewer.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4450222cd---gebofefos.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/tiwesiniwabunudodonoxan.pdfIn PDF document text
    • https://steammining.com/userfiles/file/18471826640.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/regugaxolu.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/65510047868.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/lumovoditi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a921a05ff77---19649762027.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/0diq0i4o74tb76osrr9i3i5oq7/togapij.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_off00010bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 10520 bytes
SHA-256: 000229ef72e99f6daf411f36261df76c1beae7daca2789e3a7e5fa2e26552aa2
font_02_sfnt_off00013bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD0 19124 bytes
SHA-256: fa3bbacbfd5f43d7c5ed353dbb62da43e1a23b7e94029fc01961e5516cecfcd4

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