Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b73be3c17a12f3…

MALICIOUS

PDF

93.3 KB Created: 2021-09-13 21:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da2996b9f9908f2dd723ba014c6a4aee SHA-1: 60124ac47ce02f4088f14aa646c2c5926e76bfde SHA-256: 10b73be3c17a12f32738145cd6867aa3ccf8d8d4d3a64311ef1199d2a5f181a2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://emirates-offshore.com/uploads/image/file/litivisabinirasadizawax.pdf In PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7314d1473---rowinaneki.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/fawabegafozis.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/kapetuwojadik.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b16e163b047178fd6c6f577acbc70628/3689300627.pdfIn PDF document text
    • https://tebra.si/userfiles/file/2268900611.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/tizigilibugoxisobe.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/11213355750.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/wigexubuluxo.pdfIn PDF document text
    • http://sdes.in/uploads/jipofunibiga.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/varekaviruriwixufek.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaaef60f5f---72891543353.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/e56ptkchofmrp5uok48vvmkuks/jemat.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/bazodavujapidafim.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/95279653459.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/gafameredigazusa.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/35246633172.pdfIn PDF document text
    • http://napiarsaigh.com/images/suwizab.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/29256452116.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/63489026972.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/basasapilesazazojuvib.pdfIn PDF document text
    • http://namngonviet.com/user-/files/76431990807.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/4fa2a46b79f6d96080eb1bdc2f56ba3a/zagetevolune.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c80d987a91776e8b8a212dec2ce48839/fumafadodudaxotiloluruzu.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/54813249025.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d82bc9225---33550825064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=windows+xp+boot+animation+for+androidPDF 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_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 10800 bytes
SHA-256: 94e1003731bf05cb69f62a828767844d609591b27e048caa2bc16e8a10e82fce
font_01_sfnt_off00011e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E71 18588 bytes
SHA-256: 7bb8515d834c428a84259acfc79f506c9a7942bfcb409a56afa5d8c956c51f15
font_02_sfnt_off00014fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1