Malicious PDF — malware analysis report

Static analysis result for SHA-256 658d56e2a77d6feb…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 13:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d1c738297b7e1b1ecc08d51a031b9ae SHA-1: 0a04b7239a7f38bb652daed077a47981b015fe9a SHA-256: 658d56e2a77d6feb44e1c7235ae7aebf782cd967687eed8bd292b0a0e9685947
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm indicates an effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=stormzy+and+aitch PDF link annotation
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2027644daf43c4dea056f689648439e8/82986680755.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/iqpakkoq7vlsdcv0hm9mrq2hv2/45309213105.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/60772932519.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0193994a---59989000930.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/91053b76a8879e9a8894350014be4cfe/78448558374.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/acd694720cfa12527004c9d4ed1b27c4/fonavegemulunukajukipolo.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/59518882049.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/mexuwew.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7110784c8e29cb16ff85ed16420f9869/faxoxuzenivajibu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608515d8db87e---90275846071.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e9ea9f362a63d5f9935c7572fa0a6b12/40629715075.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/49272178898.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608697d6ccf6b---13703791346.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/bfbed1f803518f4e54bc3d6d17f32e04/19613890079.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c9ef3608ebb6349c80928662d55e84c8/50432679538.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdbb1264f8---didijepelibewadasiniv.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e15dd63e4f---gelejewunoz.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a1a175cb4ca430616a74343b5f134da/92024880179.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9588acc11a---47613613352.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/f9f7d331f3003d4213d0a027440aadf4/dekake.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/3surt2ccrmkvdvn160d7921rv2/lalokagozobajazadilejon.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/xojodekiluzobolefazarik.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/bezirigatadimubewutomuse.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/r6tl7k7c7ih75v7i9f2dehb6g9/sapobovuraje.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/sadul.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_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 18084 bytes
SHA-256: 4a15bc6848da6f637b68fc1fe7e4c4d26cd5ba8baad9c37c874284ed7e010a58
font_01_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEA 10536 bytes
SHA-256: 718d8a83890acc86287eccca2294905bcb5395fd27c30e2cd4fdf7f12b03b24b