Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8e4b7c67411f53…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 08:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f76eb500d68d3ac5f7c2f133b3d3ce24 SHA-1: 938d0cc4fb2d167e18e0e150d9022f98cda8247b SHA-256: ee8e4b7c67411f5391adcf21dc3e6613d2804bd55aa997c0de1f8574477d94cd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure its true purpose, which is likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://rt-totaalafbouw.nl/userfiles/file/fapasurivirogupezidoguril.pdf In PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/dozowo.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/60695634093.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/67751299199.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0acfe6f9e3cb67da97deff64eb76f71f/japupidulem.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/kijuse.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/70050780840.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/53031137969.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/jofexuruja.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/kuwizemadipibuj.pdfIn PDF document text
    • https://datenglagi.com/contents/files/68363605358.pdfIn PDF document text
    • https://timminsrenovations.ca/file/GNAUluRAaouGW9Rd.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/fozerozazulewiditij.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/42291319471.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/efc034d538a6024be14d7271b4644f2f/31555937114.pdfIn PDF document text
    • http://pololanna.com/user_img/files/40944112850.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/rizaxare.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/pezavup.pdfIn PDF document text
    • http://yoron.net/up/files/sazegutelemifeziven.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/98539095512.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/17605909726.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/51988012347.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/juwogo.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/fivipifalubukof.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4718d7daf---66403490688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=planet+sport+live+streamPDF 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_off0000b10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC921 10480 bytes
SHA-256: d7e706215819dfe27ff99f0b47a9c985667fdff150a3f085b46b0e2564907328
font_02_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 14980 bytes
SHA-256: 08b46ad00581e8101cbcb15c74267d060bc011e167ea1f344881a3688c440790