Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81c32c62f74889a…

MALICIOUS

PDF

223.4 KB Created: 2021-06-29 06:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 03aa8fa2e74df5fca414a5d337e4696a SHA-1: 78aa383330d458cad5ac010bc6ade05213f6a51c SHA-256: f81c32c62f74889affbbf5d19b6ffd1c56a8eeaedd8b3445b830a9918337af77
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress upload directories and utilizes an SEO redirector, suggesting a phishing lure for users to download further malicious content. The document body is heavily obfuscated and unreadable, preventing a detailed analysis of its specific content or intent beyond the detected malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9459

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://aeronautike.com/userfiles/file/zoguneva.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baaeff9570a---30041619786.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/81309418754.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/25024027282.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4amh0jl26cr0v7gp955bpmcqac/vuberonotepotugizose.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/18d2ed47d4aeaa348920dcc4bcb87e85/73391705373.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/limeleposuwijapegom.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a24cf564c51---62282294522.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/nixet.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16083651e3dd75---laluzopazapon.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/fde433e4a5394a27e08a004d6b18bc74/lutupebive.pdfIn PDF document text
    • https://digireg.se/upload/mebojobikadezelub.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d29364104---86598316646.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/sikawegekixaz.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/juvasiwagipimojegewakuv.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea1073e165---bulejejodurokenawekus.pdfIn PDF document text
    • http://heureka-cz.eu/files/59431139371.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607da4faa9a2c---75274129101.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/mugixodujuji.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/31581d73a6947401b10f739da09dd835/57869020324.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ps0hhd65k6l3jov0hrc0hnjhcq/nifojojasak.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/vovonejipexerizegutuwot.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4707208922---mizasogizunux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dua+for+health+and+wealth+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0003198e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3198E 34636 bytes
SHA-256: 49a35d9ca6f7726a668b1992fba3bac9568f6321b848526c59016ff47b5c65aa
font_00_sfnt_off0002ce32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CE32 19148 bytes
SHA-256: 741300c8d964d669c71e16ada80fa41eef4d471e7972857659a7f4d6e7a6afaf
font_01_sfnt_off000300d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x300D0 10820 bytes
SHA-256: 70bfe919631b42ef3939c2256ad0b7bcc3190bfc2421152da1641643cba58602
font_03_sfnt_off000355f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x355F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1