Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee578e5910f5f3a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 05:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c385c691a637df945500e60538f5811 SHA-1: 26b48521eef8c8cae533523048ea5bd5b098448b SHA-256: aee578e5910f5f3a17553fde53eb627cb822ba47842d7fabe413dae96b706650
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. Heuristics indicate it's a link farm on disposable hosting and a phishing trojan. ClamAV also detected it as a phishing trojan, supporting the classification of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://safrano.pl/userfiles/file/21589860570.pdf In PDF document text
    • https://colakcivi.com/userfiles/file/jekore.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210903_551AC9BDAA37CC47.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/fopuzajax.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/3765932546.pdfIn PDF document text
    • http://parilka.by/var/upload/file/pusebotifozi.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///66906328936.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/11542668336.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/74436979494.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/3484737256.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/lenosexazelu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc5a22b554---8884570053.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/42727884276.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132c0215e4de---felatelixixed.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/safenegibawuvi.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/polowujerup.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/77541695648.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd3f0f896---mowixoxakuk.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/44292201954.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/tipogigobewas.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/gasosozuta.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eeca4eadf---31278964852.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/deresutebugekazoxade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=melhor+site+de+jogos+para+androidPDF 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_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 10792 bytes
SHA-256: 167c7210422d745a5c961dd959bfd93c0ec5932e633471aeeee6995cedfa969a
font_02_sfnt_off00010ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 20272 bytes
SHA-256: 97b4d54d2424fe80fc5ab8a5795b0f40495306c40c02d81ad9bc2fecb90e192b