Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1739be8eab305b1…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 07:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2eea101679ca75ebebaa621301ae0ffd SHA-1: 1a94be4a86bf598efc268a4fb65695024317fc2e SHA-256: f1739be8eab305b1e84d872063ee5dc37dbceb5966b5967758c847be8b4cbec0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=mental+math+worksheets+grade+12 PDF link annotation
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b71ce78219b---89659272774.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/winiviruniromerowugobub.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/elevajif.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/22082516469.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4fb3f2d89---54442126632.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/farerowu.pdfIn PDF document text
    • http://wjcopy.com/upload/files/37256167059.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1b05c9d6---mabavova.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/80496831356.pdfIn PDF document text
    • https://jin-ji.com/upload/files/fixududaditufijaki.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aeec4d84d---53421521227.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2011b33510---paxumubovogudajanilo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c034c04bbef---wolosizexakufovudu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c966adaa4a3---vowajelejegawexetirasasa.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/davofajakipaf.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c085bf1c6bc---wikosizovufozofopuwu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161124f009eaf0---vajozoderofewu.pdfIn PDF document text
    • http://www.toptehnik.si/images/biveruwexekuxotutelenur.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/sibowufa.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/papiwesa.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/69790905440.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/kowigonigifagas.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a27718131bd048f7be9864c3db92a2b1/tenotubesavadupinoni.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_off0000c700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 10944 bytes
SHA-256: 4f58eaaae5b0fa17e8e991a1a570bc36ca6b5e1bc9453dab533e27dd45398549
font_02_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 17976 bytes
SHA-256: 903601c8f38b6f2898d0309239738f17c225679542b72927a89e0f25b9fd3bb4

Open this report in the interactive analyzer, or submit your own file for analysis.