Malicious PDF — malware analysis report

Static analysis result for SHA-256 271e12bb32fda88f…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 09:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d06c759e15763ccc5059c508a70a5e38 SHA-1: efb19f4cdaf2f849e34853ecbda54ccf40ca916a SHA-256: 271e12bb32fda88f1d9a015e7cd0093c54cb542bd99d31f6f0a210ac5009fd20
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the primary attack pattern involves luring users to external sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://misosmile.com/upload/editor/files/tufenebizoselukix.pdf In PDF document text
    • http://retrolondontees.com/userfiles/file/32015860889.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nowakiduritazoranerixit.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b045b3e9ea8---zeligobutorapudupulivaf.pdfIn PDF document text
    • https://network-italia.com/file/xudatov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ef6d43f7e---8894563301.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/dupepamifaxoruzul.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/55191341beb8245acc64d986c654457b/93054206156.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/naxavomipasoxetet.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/66208223435.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/74887595611.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608548aae0cd4---89583755783.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/96405846984.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/nemebim.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/94429170906.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/wubaxukuzelizuxut.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/gajofipupo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/c53adadj15pkeij5gmioumg1u5/jekapegazoregi.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/61468163755.pdfIn PDF document text
    • https://synersys.fr/contenu/file/9499477404.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/nufozopebotinaganom.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/902593b03f9d2ac2c5d18200c7fe97a3/sobifumavuzin.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/21574781495.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706172d2f82---68717082625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=walnut+toxicity+to+humansPDF 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_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 10572 bytes
SHA-256: b81406bb2c3001bda715e9a7b685d46ca2d2cd8a65c4d4f8e885ac5100069b39
font_01_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001162e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162E 18172 bytes
SHA-256: 38b22179ec2ca5a8824c31fcb9a341056efac54ca386a41ce9e7404bc48769f9