Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df61752af2cd82c…

MALICIOUS

PDF

138.5 KB Created: 2021-07-15 13:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 42dba26a7c59f16543b6ab8637162ab3 SHA-1: 87556701f1d85900996240af16c43a856dee6cde SHA-256: 5df61752af2cd82ca33e21b37363234be986d7dbda62ba8aa7877f7639290a59
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, with several links pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering to lure users to external 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 http://indecomavo.pl/inc/89990547227.pdf In PDF document text
    • http://euro520.net/userfiles/file/16208449201669630818.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f500a6a2278f3af090477b8c2043f6b9/sitikurena.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/24630068821.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607925a78e3da---83782646670.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/425627f6d1b60f6b1d17cc134097974b/47848716663.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/492e1434eba3966fb0917cceea2747fe/fuxiw.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/81192598273.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a87c0c46dcf---80458256163.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d1434aad8---nulekiwesipim.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b023f2e54d8---42921051830.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/21757397ed3ba69a819b1fc031d1f7f3/64363043444.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609153a9b92dc---nibujexuveva.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085180296301---97382587998.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/zojudoz.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4b72ac99---zebolobodevom.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160efd9618113d---vapimejipenejebijawuzam.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/rivuje.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/pelodozupeganokupet.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47a3830599---sapuzozuxezo.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/fepudinolamafifoleg.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2b6869bf3c76b21d51759cce0e2fb503/xovorawanow.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d317fa0403---gizajavovukafakelawi.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/zofedakasoborizepazuw.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/27591827498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ecological+role+of+microorganismsPDF 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_off0001b668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B668 20464 bytes
SHA-256: 806a81944c4e584f9147b0395974cbeb4a7b967facd72d05a545db58b72a0bba
font_01_sfnt_off0001ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC28 10564 bytes
SHA-256: db7e862b4bf23009a0263ac1eaae79bb10fe74bd8949cb6e052aebd7662ee759
font_02_sfnt_off00020436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1