Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2905c556c7a99a…

MALICIOUS

PDF

77.7 KB Created: 2021-08-04 17:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f687d392dd314cac6db3205828f807f SHA-1: 7189ea36f31a3f6388fdced881c01a61608814be SHA-256: 0b2905c556c7a99ae33c5a18722ead86c7f3ac1c1a7ae36f133bafef79690ecf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are typical of malicious documents used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://laborke.ru/uplcv?utm_term=what+is+the+employee+discount+at+pacsun PDF link annotation
    • http://hurtmar.pl/Upload/file/novoloxakikatapebedanove.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/sogenenavil.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/73432185490.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/11024882543.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/jogivoxujo.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/33720876897.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/f6bb557d05e4b2dc5c195a9017f3652a/tujoxonegupugepavuxil.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160e00d3213f1a---subujafojulabonikep.pdfIn PDF document text
    • http://learningkey.org/userfiles/vujokurexob.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a48610db90---53506054530.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/xofunatemekugijosiwa.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/6248ceaadeb78db7c106781c99ee69c2/manazurivufazifuju.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890fe1a1992---15065713702.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609016d765cf0---xibaxubejumo.pdfIn PDF document text
    • http://fruitsad.pl/images/file/rumakugilusabeluzudu.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/59856589708.pdfIn PDF document text
    • http://w-mill.jp/images/file/15037070224.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d6eb67eec3cc952dd27b0d4bc94a50d8/kamijopavix.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/j3imvomre8mf49avf7ufovo25r/kofasorisamakex.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/dakitip.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/8177f4c857a064e7e4d2fa83842ea201/81632035984.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4eb34077b0---35564622764.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9f2894356---porefumixipivaburaletum.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/5093768766098c688d33b3.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_off0000ca25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 17128 bytes
SHA-256: 4190bf80297d7436a125feed435023ea6b4d1edc5c7eb2b6033a179c50fb3d74
font_02_sfnt_off00010f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 10888 bytes
SHA-256: 9d4b5e810f19f1a70958bee74b8ce0b7c689a77643bcabacf9f2c201001899d5