Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97f4ea2ef4f25f9…

MALICIOUS

PDF

82.1 KB Created: 2021-10-06 19:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 55d8d4a645798ce8831d316ae7ef567d SHA-1: 9986fd00ce624429a306645777c21b5905809205 SHA-256: e97f4ea2ef4f25f98645b3b2b58dc9cf8bd6ae630d3dbd1a43c62757283a9cff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable hosting sites. The primary attack pattern involves luring users to these external sites, likely to deliver further malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://prime-standard.com/piceditor/file/fakopazogipidinit.pdf In PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/xenibubejijasenakunuki.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0fa541908---83067221612.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/21439467486.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/xuzodekidipodokoniwaj.pdfIn PDF document text
    • https://music-group-store.com/upload/files/koduwojunoreparu.pdfIn PDF document text
    • https://31app.com/userfiles/file/32897799864.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/52353977812.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/086dcb5a16235d02ca22e445befe4e10/39000361989.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/48e86183b718c23648e1b972cb5b27de/78843915378.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/xepogexo.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/93181158876.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/topifulesa.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/wozuwususibelid.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/51653722727.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/tijawejuwimi.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/21975761475.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/tuvefuzo.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/76425743582.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/gejujonigiwizod.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/zuvezijulat.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/zigukowobariw.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/20280579104.pdfIn PDF document text
    • http://balony.dmuchance.eu/userfiles/file/xifepubolojun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+angle+with+laura+ingrahamPDF 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_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 18960 bytes
SHA-256: 0a7cd924a34e141543191644dfc743f936de117afb428a2a638fead6ea609ae2
font_01_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 10416 bytes
SHA-256: a61b57c2e883a212622797ec712cbe9d9c74f389d29524913aa78cc6c15046dc
font_02_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1