Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7b05a0817c4d7d…

MALICIOUS

PDF

92.3 KB Created: 2021-08-18 06:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0ca50cd3abece31dec1fa903a88987a1 SHA-1: 432e44e29a0cd2d2fd9dfd8cb3e38175eddbc04a SHA-256: 5d7b05a0817c4d7d555c0a65a97a6a7984fecc02a729633650d9646a2ef67545
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2d30285f---85677074472.pdf In PDF document text
    • https://weyergans-hcc.lv/userfiles/file/30976704133.pdfIn PDF document text
    • http://esistore.be/userfiles/file/likoduwuxejifulusegenugak.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/taxiwagalojemuve.pdfIn PDF document text
    • https://dhesient.com/media/nutitojikuxudaxum.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dcc20d96d---49521617498.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/84304247873.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/waweriniw.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af34d31229b---80052495385.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d61526a534---rirukivodan.pdfIn PDF document text
    • https://o-dance.com/upload/files/jexirigor.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/23657588326.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vadobetawabesoxote.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81da21ad8---82796787027.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1c7100b9---gexekamotoraribirebimeg.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/64f2cebe0136d87a298c942d7e19ee6b/15443078111.pdfIn PDF document text
    • http://rotang.net/userfiles/file/piduvenagexinegivozof.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26450cbc34---21256971492.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/25786577080.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/39696939996.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/nekomikokifa.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081b48e51a01---92016701244.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/17816169514.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/wepazes.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/58354656741.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/domubuvewijaxuwasodedeteb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=meaning+nature+and+scope+of+public+administration+in+hindi+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_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 11300 bytes
SHA-256: 5babc2c462df6589706cc0caad4a6c3121f9f4d67adb3e7192ad367fd60bcb01
font_01_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E9 17168 bytes
SHA-256: 06574cbfac2a3705464e0d3d718c6ad8200487d5ea0abc3df5a672bc27b4cf4e

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