Malicious PDF — malware analysis report

Static analysis result for SHA-256 b115457033aa38f4…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 21:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 063e05b56f97fdd915279da712484271 SHA-1: a7ce7ab0939e920036a7d693c1bb26c711c54ed9 SHA-256: b115457033aa38f40aafa0dafbe9b10b17fccdf27f1330e817e0ca22e365677b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and other domains. The primary purpose appears to be directing users to potentially malicious content through a network of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ackerviewguesthouse.com/userfiles/file/96041291007.pdf In PDF document text
    • http://x04ydivan.ru/userfiles/file/83508611178.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/6050262567.pdfIn PDF document text
    • https://lordoptika.hu/files/files/72064218688.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/53921345145.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082525130a1a---dowapesupib.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/werivujukofeb.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/87442677363.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/88370986585.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/madebit.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854a73bab27---kovamazibexazuxaviwore.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/pawigokawidomedenufovavoz.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a12a3e60e---wexozigumoladakubixex.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/vunafamibalu.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/3e2e76232c601f7cfdaa498e10ed7e68/buxur.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/59937049603.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/8869541269.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/gesagavose.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/35109963051.pdfIn PDF document text
    • https://wsbtitan.com/images/file/sofabug.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/40610211431.pdfIn PDF document text
    • http://abpaluso.com/upload/file/37766743905.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160faf1e81c196---gotafofok.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/20324162886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fourth+grade+reading+comprehension+worksheets+pdfPDF 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_off0000e713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 11276 bytes
SHA-256: 1c1770af020a9e9e99d033718d008c19759321bce0d9d27981e77af024886c17
font_01_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 17784 bytes
SHA-256: 429189de5fecaf22e93fcce4ed55522ef7182f728bc4e6d60fdad81fef42c279
font_02_sfnt_off00012ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1