Malicious PDF — malware analysis report

Static analysis result for SHA-256 72dfe06add12611c…

MALICIOUS

PDF

88.8 KB Created: 2021-09-17 08:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d4cc7e883a2b09027f84c9185ed799e SHA-1: 78780a73da23af84094a627ddd379ae64a53b465 SHA-256: 72dfe06add12611c816ae4554a1f9d2b46010845bf42743f3fd6012baecb0414
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan-like nature. It contains a link farm with numerous external URLs, several of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of multiple external links and the compromised hosting indicate a likely attempt to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rtm-plus.ru/ckfinder/userfiles/files/ronumuferipawixejo.pdf In PDF document text
    • http://haphadoor.com/upload/files/mejiribisubetelirepinos.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161363ff316575---38528353426.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/5898777726.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/1753293697.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/vapizodel.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/79272966727.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/kejidunuduzepofokas.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/dojowifunamaburizaru.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/92039395004.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c315d7ee322aba16872c2c9e010915ea/vafuzunubijixa.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/nulirugisusuragesif.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144090e933c6---fajozabawula.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/95764926929.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/2904372863.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/31687444490.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/62537645523.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/kowozoluvafotijesidi.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a311ca4c4c---12964814157.pdfIn PDF document text
    • http://redactron.com/userfiles/file/nakixo.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/50703501489.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/41214945729.pdfIn PDF document text
    • http://tnetimes.kr/upload/file///9183803883.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/siwuwekozolilovaga.pdfIn PDF document text
    • http://stonebreaker.at/29517758240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=note+8+android+10+updatePDF 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_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 10632 bytes
SHA-256: ebe16b38a06cae05479fdb516b9660593a02b70993e4a4937dbe41e068a509a9
font_01_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 20712 bytes
SHA-256: 4a2c238c2168b2dfa288e8509a6bfd9ee048985ad7234478c6b9c7dea13fe0d3
font_02_sfnt_off00013d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1