Malicious PDF — malware analysis report

Static analysis result for SHA-256 340274f93f8e79e3…

MALICIOUS

PDF

72.9 KB Created: 2021-09-02 15:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 462b483184f70eb5647325e815af822d SHA-1: d017ea68f545e189b40d1b67da0eed7856c96620 SHA-256: 340274f93f8e79e3febebfa42099ab0b55b6cf1812b017121409453874993b89
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites, likely intended to redirect users to malicious content. The presence of numerous links on disposable hosting and compromised CMS uploads indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/dl5eo1v8q0nmd0vmv0itlibsva/48393519662.pdf In PDF document text
    • http://sevinctekstil.com/resimler/files/1674096048.pdfIn PDF document text
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/bojuruje.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161146b77013a8---wopufep.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ca63e23a---zulosaforuf.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/12241958332.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609da380d7702---10996782965.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/05bb2440ef6c93f6d75258c099464b1f/7067754473.pdfIn PDF document text
    • http://temple.mo/userfiles/file/vewufiwipogajamizebid.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/basadape.pdfIn PDF document text
    • https://anjingliar.com/contents//files/14169112220.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/4066706197.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/dupupodudekup.pdfIn PDF document text
    • http://safarang.com/basefile/files/dubufavusobarasogatuwigo.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/72811307178.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/dasubuf.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8sf71adhv7kj4a2vvo4qnaf6b3/24029241824.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/jschr9gi4k9km168l1qv5lkq34/zinosebisov.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14ece8f1ee---jowazux.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5a475f45e---92063028485.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9ded4daec26a6192fcf37d1ba11aedd2/nidupegafagado.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/6897402952.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/pasezuxawekopof.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/65446336977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hadley+wickham+ggplot2+pdfPDF 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_off0000bbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDD 11100 bytes
SHA-256: 729010e46418438388fffedc294e689fd4ac501f383c8fa3fa6cf95ac297e9a8
font_01_sfnt_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 15952 bytes
SHA-256: 286b57f348eea82fb3a05d5e2888814a5298f3001547f1423827d0d97feba870
font_02_sfnt_off0000fdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1