Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f28573159f3a4fe…

MALICIOUS

PDF

87.8 KB Created: 2021-08-07 20:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d56992fa0e7b09237c62729fb85bbf66 SHA-1: e3fa016dbf25aaef50aa4377500321fa0a6c106e SHA-256: 9f28573159f3a4fe11991e021c22b12a420997070e7c2d12044de54af589419d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://bebelino.ru/userfiles/file/wotijobepij.pdf In PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/pegudolixafifigedurop.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/69413980840.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//vuwimetiraxixilododu.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/54412739182.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/91101b739e51196e865a702b13227c81/57800999608.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/96901086618.pdfIn PDF document text
    • http://fnathservices.com/upload/file/69364931570.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/xibekurikiwit.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b5636492f138986a7c913f192361710e/92979303870.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/v89so96hqjdlo5n522nsu09u4s/dejilepaxodumopa.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/vipafa.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/damike.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/84c79b5df148e781a81f1b8f359ecfef/42797466639.pdfIn PDF document text
    • http://servmed.net/userfiles/file/loteri.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210723_90685FFA32FE3C4B.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/m7af2kstofirh8dv8bhko5sjbb/64790822744.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/pagok.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021061623061163.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/nakoruripuwupojakejo.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/27494556964.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c7e8487aa---vunufonadijokofipomitoj.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8201125218---36831762346.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/85d28d91b2120cd94e44d7f2281c8c78/xafolisalizufegokepijuj.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/giviloxanuxixekiji.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/d69a8518f8606c5fa1d1a3063b5e2341/wugulunujedisoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=can+i+get+a+payday+loan+with+a+prepaid+debit+cardPDF 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_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 17408 bytes
SHA-256: 33fd53e27cc6a25dd61f906d3d41e5128ee544bdd20f099088bead04f226e659
font_01_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 10996 bytes
SHA-256: 4c332c8dc31e0367cbb793bcf631c2e8a05591d2ab89bb71d2523c43812ab3d9
font_02_sfnt_off00013642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1