Malicious PDF — malware analysis report

Static analysis result for SHA-256 802a9989845127a6…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 02:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3c60289e8e117e88d7b0a1fa183c9d24 SHA-1: e1b0652c21e6449874d9de71efaf51f8bd980430 SHA-256: 802a9989845127a6f7faa00a42460b53683348257b30583366d6d18ac8482e0e
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=atividade+trigonometria+no+triangulo+retangulo+pdf PDF link annotation
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2853fe5cdb---taruvesifunuxuleguneduw.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/nakujitorafewux.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210720092123.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/rorixasiwufixafilo.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/puvuxosukikepaz.pdfIn PDF document text
    • https://ckmandarin.com/uploads/medekit.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/82138133087.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610770dd4fcdd---45290143711.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202108161020351434.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/30167177970.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606da06c53ea1---11394062081.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/92504277153.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/mubazubadupufuzevu.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/40674510202.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/74758357684.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7fb10c61---64740467163.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/69716f737ef28a8f7ef1b62519916919/gezobofewunuzopowim.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/200010ad8a58459d589ebdf901521979/tibasepudisopanivoza.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dddecddd9d6---mamogawusewezazemuxinibe.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/99e538d2d90868e27f9d5a81b0943c7f/75717324082.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/pumav.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/widuw.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_off0000cdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAE 20828 bytes
SHA-256: b43e02e57d44de5d2ea18ead45236fe79484207d275a49c3a33253427eddca45
font_01_sfnt_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 10820 bytes
SHA-256: b1b39f899190031c3b71a79a1d0b490fc3ca9294c0bb3a05a037eeddbe5e458f
font_02_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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