Malicious PDF — malware analysis report

Static analysis result for SHA-256 fada8a3d5a42ddf8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 06:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4b8d6e0da75efb7338eb0efa63e545e SHA-1: 8af13040629ffa167d19f82e77f57d8dc0b81beb SHA-256: fada8a3d5a42ddf8e486271b4e935d57d516a39d8fe05af2a60b30291cbfd4d3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content. No scripts were extracted, but the presence of a link farm indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://3dsami.org/uploadfilefiles/53118857458.pdf In PDF document text
    • http://dgone.kr/userfiles/file/20210809014137.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6fc914401a1b8eeba5b48d72302fe0c6/denemovuzujexeg.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/lazikufijozubobitij.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202108310944416600.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/siwovoduwegamobo.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/54135681612.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ef255947b8c41540a50d83138a29c123/jinadud.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b81fe9c772---jejarawikogal.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/36556151752.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/lagozivunod.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///medepisurubajopibuvujoju.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f9ff04dd8---vovilapitozaz.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/xupafobel.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/62110420744.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/86382253926.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/53920139206.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/duvok.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/faef7b4af8f73438ecaaefe61236c1ea/26332368661.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/00742d07aadd1d54f999b1127210eeb5/48415026978.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/12639cc2d7d35ab65d15a0d1ed79b477/14387284220.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cec5ef658---27764910793.pdfIn PDF document text
    • https://morabia.fi/images/file/73680744939.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/89672733531.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d3447b58288062faaa67cb8fca48f6f5/dasopidilamuj.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/zoxumuwisevusamujuboje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=indesign+place+pdf+blurryPDF 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_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 10884 bytes
SHA-256: 82d76d36f25b1420529d8a80552ae6605d0cf8f1e158d12e5f5d6ffca2b7a633
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 18104 bytes
SHA-256: 3aeca062f96eebc2e30cee139ee2abc48b6862149dcab4d76f65eaa90c633d07

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