Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b7443214d39ae4…

MALICIOUS

PDF

83.3 KB Created: 2021-08-13 02:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2ea7ededbd9f50c9284103bbd45a67aa SHA-1: 558edf3a0dbac5f1c12a135373c3af2034c8af88 SHA-256: 20b7443214d39ae49b33877eed88ab4b61bd5c00d4a2fdeab400f7528481fa9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple URLs hosted on potentially compromised CMS uploads reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/t4mji6t4gif4q0suof3kk298a6/tanasizaditufezag.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/269b9bcac31834c187cd22f71d37e899/92273698863.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e387d17e9a5---daledulofidavixel.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021063007100373499.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/fesub.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/jisado.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2b1164990f2c6b4621ffa6466e0b41b6/dugeputesujoped.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/v5ps7ko1hpnt1pbutqhn8esljn/zizomiwaf.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/paxeratezovijifepik.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/1vl05i0c0t316umr8dhd13gv93/famofudu.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/22720780613.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/10225006094.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/41698491685.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/24225001647.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b76c020b2c8---vuliwofixe.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e397183fa---wenag.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/13728249167.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcf0588698---fotuxegewar.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/80ec9cf222f56529d003049ed8e9bab1/bexagubiroxivatiko.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa32f531c2b---76531463911.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/39487474029.pdfIn PDF document text
    • http://myphamasia.net/upload/files/tosonadetitoj.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/lixoziwivo.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/poliwozojupamifigojudaro.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856d9946969---76202726238.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23b42df484---jurulixaxajididoninabis.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/99118485573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=candy+crush+soda+unlimited+boosters+apkPDF 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_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 17676 bytes
SHA-256: 446b49270505be1d0c113e7afbffb536cda32ae83b3475a69afec56c013115a7
font_01_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001236e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236E 11256 bytes
SHA-256: 9793f2b0145d07f70ed67425099cfd8507ebca10b8fdde9561b8134db9699d92