Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c5491dd1b49d9e…

MALICIOUS

PDF

85.9 KB Created: 2021-07-08 10:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95a58b88ae47457513691662de53eae9 SHA-1: 81e134f11ba9782784ddeed964c5b5775b4adef3 SHA-256: 25c5491dd1b49d9ef26446c5d0662351b1548a248ef54f700e7093ade832cdcf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, which in turn host other PDF files. The presence of these links suggests an attempt to distribute malicious content or conduct phishing operations by leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/171b57eea9a77a64e3f43a05a4166837/77322967566.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce27e8c78292260f753c07f65030de4f/19703040576.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cf2326bbca39c2aeb856a8dd9dbba7cc/27398871308.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/3a879e0bb1b01adf668f0c7c174c96a0/kisowajeliremujosogopeb.pdf
    • https://alakharia.com/public_html/userfiles/file/nunorekujanusef.pdf
    • http://lamelove-zakryti.cz/userfiles/file/19912183570.pdf
    • https://noriupapildu.lt/ckfinder/userfiles/files/fupebokojoxa.pdf
    • https://guruamardaspublicschool.com/userfiles/files/42939032714.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/3f5bf9faa5145579735d24b77e991db4/39113060888.pdf
    • http://www.petercar0937494634.com/upload/img/files/58044380588.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607962565f020---53186482662.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/885304d272d4ec7d8a5839513771cdd1/4934742299.pdf
    • http://zlato-stribro-investice.com/upload/files/52825324862.pdf
    • http://austral-immo.com/userfiles/files/70063175396.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/gosinotir.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/7qvg7s0srfavr22l19ac6palg5/95603385788.pdf
    • https://pasarantogel.com/contents//files/24410007616.pdf
    • https://mimpishio1bet.com/contents//files/juloz.pdf
    • http://boldino-hotel.com/ckfinder/userfiles/files/19717263989.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ad32f6ff243f577021f8df1c6040493c/96736666882.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f491236e43---xatanatu.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/36c24f0de3c2ecc4a1543a370f9c70ab/18757441223.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c48e1bb832e---xoneboriluretuzorunuzuli.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/638n0d6l53nobfji7okhd61e9d/34183152403.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/151ce23afd0842e2251b1203e68a09d9/3050520355.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=use+open+ended+questions
    • http://pro.ovh.net/~tribuene/images/banque/file/20518947793.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef43.bin
fc93a61cf17a12dad1db69c1d65ec8946a85f5b1e6e9579f6257707410c6f910
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 10328 bytes
font_01_sfnt_off00010677.bin
61ed2a95d292e35abf0b0196c12c144e6459f5c026431c8ac124444287040bc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 16920 bytes
font_02_sfnt_off0001321e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1321E 16792 bytes