Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfff4d977052f55a…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 04:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81a8c9db0aee1877b06b66db161f3190 SHA-1: d207ee50e71379f1cb5265f0f7a3ec03e8a7e3ad SHA-256: bfff4d977052f55ab76a9e5386dcebeb506de91df1f2d20a45d14c2ea5092158
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Multiple URLs embedded within the document point to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://philabc.ru/uplcv?utm_term=does+androids+dream+of+electric+sheep
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613a25458fb7f---jebusopawise.pdf
    • https://actorconseil.com/files/file/99119810381.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/e8cl6dik46l1aceu591ger4nu9/41633065614.pdf
    • https://bitree.ru/ckfinder/userfiles/files/gefuratiz.pdf
    • http://home-plast.ru/foto/files/teruxavopa.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4d79798a7---pujabipotitewasuketilipi.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/bosofexigufozefugosa.pdf
    • https://linker.tw/files/62813479738.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161463fc3bb1b9---43923837927.pdf
    • https://ingatlanfelugyelet.hu/uploads/file/rodaso.pdf
    • http://yourmoneyyourbank.com/uploads/File/gepagogebunuvojeladetupu.pdf
    • https://aldaserwis.pl/ckfinder/userfiles/files/zajejokuxenetepitelo.pdf
    • https://leifs-auto.dk/images/file/mixinosodesununinemedim.pdf
    • https://itchanoi.vn/uploads/news_file/lanarasiw.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb883edc6---37843851989.pdf
    • http://cnpair.com/userfiles/file/53511466492.pdf
    • https://nakipoglugroup.com/upload/ckfinder/files/gikokabijalexunu.pdf
    • http://jfhcoaching.nl/userfiles/files/2216742733.pdf
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/falugak.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/43787639776.pdf
    • http://smartpaintingplus.com/userfiles/files/movoruwekubo.pdf
    • https://www.sophrologue-nimes.fr/upload/news/files/gasofomuf.pdf
    • http://giovanninociti.com/userfiles/files/3947097417.pdf
    • https://netiko.ge/img/Data/file/xofewezule.pdf
    • https://divinenine.net/userfiles/file/42399612913.pdf
    • http://strap.sk/uploads/file/92177094190.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b570.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB570 16792 bytes
font_01_sfnt_off0000cd87.bin
d267ecafaac80455a8e67fb3aff436efc62aa15d8bfa6f1a5946174297decb4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 10888 bytes
font_02_sfnt_off0000e67c.bin
33711d870f798732bf4bb380a5b5eb97cd0cb6fc39ed2d15541338324c7cd985
pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 16840 bytes