Malicious PDF — malware analysis report

Static analysis result for SHA-256 82816f4195b09c30…

MALICIOUS

PDF

86.7 KB Created: 2021-08-12 05:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ee01a61d71c159ccb9e509f99eef26f SHA-1: 7480e76bb821776938e45961bde46eb53a8c47d1 SHA-256: 82816f4195b09c306be371f8b78ad1d32b651331cbe35c40bb1d45a7c1438eba
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple external URIs and compromised CMS upload links strongly suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://chcial.ru/uplcv?utm_term=taylor+indoor+outdoor+thermometer+instructions+1730 PDF link annotation
    • https://samarpanbharat.org/trila/userfiles/file/78619347682.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d76425ce2e---68244020296.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/5797130644.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/sekelaxefasaxirololenaxep.pdfIn PDF document text
    • https://faceless.me/userfiles/files/2757690193.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/23797945018.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607260a7aaf04---80587757943.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/0brops4tq0b6ns6kom9om51fib/bukoxajetigu.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///21109046014.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/8031857155.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/78654326301.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608896f002d02---30706669864.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160810e085f7cb---96318557315.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/samozezenagejoxivuxifar.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b56414c00b---13838560288.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/kasolafe.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/66042673805.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7427de8db916ae57e918de6005b139d5/vedikubozisexunonuze.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/1179786245.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094146e8f95c---bufokeweguwesuzanoke.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a4d737d54599568b91fcb19c18d5f9c3/taxapevubamev.pdfIn PDF document text
    • http://wwstationery.com/files/file/29793283362.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090b0953a494---tuzimugi.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_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 11208 bytes
SHA-256: 4c9e5845ce108fd840b64ac924d9640803276e2ddaa8cd44b67e419728d9cc7c
font_01_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 17616 bytes
SHA-256: b5b961e0908b3c5f946dc23438d90ce68b2992fa5f5a55549dbe0951ab53de1d

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