Malicious PDF — malware analysis report

Static analysis result for SHA-256 435022e33dacc079…

MALICIOUS

PDF

75.2 KB Created: 2021-09-20 12:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7204a04bd57de9ceeea1fc202b9d767b SHA-1: bc181a8fe2ab4671d7e49aea3dbded78d7afb0d2 SHA-256: 435022e33dacc079d18347bd3f48c9be3985ed16102ffaa38b197fdcdc023c53
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to various PDF files hosted on disposable domains, a common tactic for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway security. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dpsnowodworze.pl/userfiles/file/kegaximemo.pdf In PDF document text
    • http://abwhopewell.com/uploads/files/56322350598.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/vixudexivapozajodufavelen.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/tunoraxotafalarino.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/lixekepewirazam.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/bovivixugitik.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/40303220093.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141135796904---61421538752.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/mojotadexibor.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/64569013379.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/92959987326.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/66782574149.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/18749596756.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/16496407828.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lqr14usv6qhkoc54mkrp5dqc3o/31513236780.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/61656349081.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141f43fb9654---46266994790.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/37999488157.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141421eccd50---xaduzetajopu.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/rubuxivudarusit.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/zujomuwuwagabeki.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/noxozim.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/14254017887.pdfIn PDF document text
    • http://keramann.ru/uploads/files/tatutitumusagamedumolezap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=reset+icloud+password+with+phone+numberPDF 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_off0000c2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 16260 bytes
SHA-256: 2fa4163291dc5a8bea97c57c9eef53f3ec476dd1a4904ea5741007411dfe0ed5
font_02_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 11152 bytes
SHA-256: 794a0cc64b75dbb314aa14b392fe0e56214120ae31f5850ab95cf3c4a503b6b2