Malicious PDF — malware analysis report

Static analysis result for SHA-256 c781efa91c49512b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-02 01:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cc93c58b279f7b1ef734f5ede04ff352 SHA-1: c2a20f05d569381dcc2e519b699b149e343e2fc8 SHA-256: c781efa91c49512b3be97ec5cae7c2c06399cba830b68fc4e83248d5fb555a34
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lure users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9361

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=s+letter+names+for+boy+latest PDF link annotation
    • http://absolutelyneon.com/userfiles/file/65950440974.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/82751537910.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/87064156183.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/2ed0247776e6f0432eb6675a028a986b/58484071131.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cfa6f3417---74124432883.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/milafuzoveduj.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16070529ab8b2a---60943387350.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0dc1699f03b44cb7cee5f8ca85e38298/30328549542.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3f8109ba30ad23d446ba9f584a7511dc/48307344962.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/wokifozawazusarig.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b82c3bfe---sigimidawamunasariba.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/s1o0tsmg55mpm815443pp0m89j/56153558323.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1ebecf7ff---39285445355.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/74572111568.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/kaxifufebebamowagofodozu.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/73483447445.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901072e5a6f---kafijaxori.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/nonurikirena.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216161447293780.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f83532ab364af744760faaa2f739278f/6420666541.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lb0n6btad735q576l1d406plcs/46502318595.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lbnnuvarqh53u8ftkembnbdf54/55039351379.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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