Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1433562009670ec…

MALICIOUS

PDF

79.2 KB Created: 2021-08-17 16:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 58c774e702cf6d3edd779bcdc7cf9bbf SHA-1: e0c53639ddd2965687450e11c3cdba9e69e65bda SHA-256: b1433562009670ec172bfb176e7679d3ba5f582ef183a3b492077f1d1067f799
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary goal appears to be redirecting users through a series of links to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://martonaroniskola.net/userfiles/file/zimetopedazipifavapuked.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///11211679110.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4ab91d64---tonedurozef.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/24796916954.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/b42jl5egojqivbp09bhmviic15/tulazogekilisaxojepa.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941b12e1c60---55591244149.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/68198906525.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210713044304.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/xoderevexokumupazawa.pdfIn PDF document text
    • http://talleresjpg.es/img/file/kixonexi.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/88233387351.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210603083619124.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610afe3b776ad---kojeralumorefo.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/bivagomufizo.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/8c50dffe169b011544992414b6488a34/wuruwagidi.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/95555078098.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/7734632786.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/votesoporirazafi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5576f3be2fb134dcf7601a43c507620e/dinaxivudusijotojaz.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608451514d322---pitudopasolep.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/f7clhqku3sk4kfqrm7kbkeo490/gawuduzekuka.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/sagifej.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607131c22cd99---wexed.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160813cbde8af4---vevajavuve.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099755dc0d45---32793042895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=schritte+international+a1%2F2+lehrerhandbuch+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_off0000c829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC829 21068 bytes
SHA-256: 19697580735caef52aa151c358dc9c4163b06362387572793e4c246aa0c865b9
font_01_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 11068 bytes
SHA-256: 4ab449cd655345bcd2d36bd54514dac897115bdeb1442655f401a5f8758ea9cb
font_02_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1