Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1533ee079a64b21…

MALICIOUS

PDF

90.7 KB Created: 2021-08-01 12:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4376a2e01b508cfa0b5a247b864daeda SHA-1: 37323fb1590f6c10a3ea40983e8076d6e07f20b0 SHA-256: b1533ee079a64b21f1b6301dc3852c23dbdc507b67a00027256aaca7ac88d16c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external URIs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=abbe+refractometer+principle+pdf PDF link annotation
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a78098b3693---59956592538.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/gopulosusukibamer.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f1f71c6dd---dibofamuze.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/1a89b1f5653c24a72612311b3a871931/32831619715.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/fovefaletofibibuxelod.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/3388035782.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/xafofosowi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6471428101---82611787586.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/54416415499.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/kelirav.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/fuxekojufilezepar.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/37404585878.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e17c70b0b9---bavazeridoxaf.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/bomibidira.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/11391629053.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d0dfcbfe3ac7aff76097cb42c17a9038/bogeku.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b4d916aeb92e7738172f1fc2220b5774/57553609581.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d78eac375---71411176843.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/natsesduhvecuq47cjmrue26j6/ninujolovedaso.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/molamafipafemij.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kf1hn4g9c54dmbhaie4d0c8ja4/25865820701.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a792c68e1---17691203586.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69fee703dd---wazasofetaro.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ffa83df9d50ea8a30500c2350d813b79/boken.pdfIn PDF document text
    • 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_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 17052 bytes
SHA-256: 82197bf743f8c4e569265af3d5f55d0c9c74537ebfeaf6369f2c7f75c16efee5
font_01_sfnt_off00012b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14396 10732 bytes
SHA-256: e518152386e2ee8c05626edbbd8909ec7e03e14c2c24a3f3e813d2e2cdfc3261

Open this report in the interactive analyzer, or submit your own file for analysis.