Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e40261e19f42421…

MALICIOUS

PDF

83.8 KB Created: 2021-08-26 11:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 6c4d12333f19b7f6dcc2dee071d3e85b SHA-1: 6c5ef1dcd8175770da077be1106cf2f27a5aee91 SHA-256: 5e40261e19f42421e19faea84056b2cb6b6edf9995583667fff1d633d9f9bf0d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aiswaryamatrimonials.com/fck_uploads/file/miganadazadixudaru.pdf In PDF document text
    • http://dobrejaja.com/Upload/file/pafiropikezof.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///wixovogodekujurabakuzag.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/vagifuzopeposulunanogapu.pdfIn PDF document text
    • http://podushka.by/files/files/bagomevafavojikalubebizeb.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/mejezonisodewuvaj.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/zubem.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/5499800609.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b4d77e24724ae2d4fd6a2c3990ebdcfe/vivurobuzi.pdfIn PDF document text
    • https://sharenkon.com/files/51495203770.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/aaf788d83b558e94c7091098f9404fba/14000628596.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/53t9igu0k7jqo0r74hc9206dec/sujifemot.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/18715096509.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b33d1ba77a---wavakekale.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/dojofoxewatunazugawajojub.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/85980992110.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cef3eb1ce---funoxek.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077ae6c9ecd8---fiputovuxokuzopinexog.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42777592832.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/39770477968.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b73930154fe---68723448943.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9350b0c6---31705164326.pdfIn PDF document text
    • https://securitydm.com/slicice/file/8582442935.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd871072f---29255505964.pdfIn PDF document text
    • http://hilltoplancers1975.com/clients/13753/File/39776321663.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/43820736632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=3+letter+words+with+youthPDF 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_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 10452 bytes
SHA-256: 91cf5bec7f02810a71be6132e21603aee97668d31e33c87a40986cf37fa3ff30
font_01_sfnt_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 17236 bytes
SHA-256: 030e5e85b0c24f64cb9f036c81ce85209f63271e5aeede95269407300c02da52
font_02_sfnt_off00012967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1