Malicious PDF — malware analysis report

Static analysis result for SHA-256 0879b12854b53b71…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 18:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31d97f17ca35daf1c704d0e4e8e29abf SHA-1: ef5e603d2f0efd314047947b63c7731cedbe8077 SHA-256: 0879b12854b53b71ff881bae2d7ecec3ca9c5fb80dacb553b61aa60b4a2d852e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous other PDF documents hosted on various domains, some of which appear to be compromised CMS uploads. This structure is indicative of a phishing or malware distribution campaign, likely using spearphishing attachments as the initial vector. While no scripts were explicitly extracted, the PDF format itself can embed malicious JavaScript, and the heuristic firings suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4659

Heuristics 5

  • 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
  • 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://service-panev.com/userfiles/62641056167.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kh2c8apbjkp7khracgngmfmle6/sewimikazuvo.pdfIn PDF document text
    • https://biocoils.com/img/file/7613809804.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/sebijazaneboxa.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/71414822868.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210909225628.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/50541963096.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/wixajoduleko.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/a335179197ba19403c612c0c10c480f8/91459472946.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/xebobajukutiwus.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/xitudesaledok.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/xipenokupafepikom.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/lupezawep.pdfIn PDF document text
    • http://agilesolutions.in/uploads/88423466393.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-08-10-37-32-z33T6mnV.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/lavilamokezufasotoxesejun.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/33282416403.pdfIn PDF document text
    • https://icbacademy.com/upload/files/sofetagaxexisaxidapaz.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/misuzu.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/laruxekujepewepixewap.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/18980378697.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/gemegidixage.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/6c105fc7bec6b90869da94b131d84bf6/85023123676.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/38922728011.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wowezeluj.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613082985b244---35144537662.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/simadetulogelevul.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138832c3c501---lezaxalin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gre+official+guide+2021+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1