Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fa090d65d0f83d…

MALICIOUS

PDF

73.7 KB Created: 2021-09-22 11:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1dce3c33ff3388f6a39aa441064bd50f SHA-1: 12165edbd3830c13908415b5db0aa59d1804230f SHA-256: a2fa090d65d0f83d7d7ad22003a5ae4188a86ddaab292c5e6336582b4f82475b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and link farm heuristic suggest an attempt to trick users into visiting external URLs, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://surveycook.com/upload/tmp/202109/file/tesotuzesijenonizapiwite.pdf In PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/bodilugerunobaxokavoxugi.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/robotuniruwi.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/12322821028.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1a2ce72e---19335276878.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/53907012087.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342c9d51503---55119479427.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/32969068956.pdfIn PDF document text
    • http://jucal.es/images/file/80283569869.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/lasamoxutotanaxizolu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449877c1140---83580000637.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210913_9F3BD1C9517A8882.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210914_64D2930C5B8AA49A.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/39292811125.pdfIn PDF document text
    • https://songhongresort.com/img/files/87804948108.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614248abb03ae---rikidefolumufaraxivege.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/nifesebogopakezuzezo.pdfIn PDF document text
    • http://geasit.it/userfiles/files/23953576460.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/lemotonukaxitomidofumaka.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/pilimofeniwi.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/zujijadapetopetasex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kitten+cannon+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_off0000c0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B8 10140 bytes
SHA-256: 07f473ff8e73e999b13d470f1c041c8af921b7c2f6ccb0223d335aeada7315fe
font_01_sfnt_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 16360 bytes
SHA-256: c783b9b7ecb06821c79682bbec17979f9cfb553302cee13e0e3f4ab6baf3c9d4
font_02_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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