Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d296d505ef4d96d…

MALICIOUS

PDF

76.3 KB Created: 2021-09-26 15:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c775bf2deec9a9bcfc7e44e21349350 SHA-1: bf2565d44c8d600250517d672e70ce5129bacbb7 SHA-256: 1d296d505ef4d96d8748d3acd59d123d316b9e473cf209db2b0396701bcc4ddb
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous external URIs pointing to various websites. Some of these links are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://joyearland.com/ckfinder/userfiles/files/xotutepilizerewubufigamu.pdf In PDF document text
    • http://amghanoi.com/images/ckeditor/files/nebapinepuxetob.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32549444875.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lufafutatixigijamum.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/tjn20og3t38ppk7himmmpi0n61/ruzenonojuzejenesamasinu.pdfIn PDF document text
    • http://gptools.net/userfiles/file/midifojakim.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/loxapilutavukon.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/19388060121.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/xumujitigodobimoxofilere.pdfIn PDF document text
    • http://fitviewer.biz/files/file/91091090791.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/zabefuwetefetisawizatufum.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/sazulomufunofeguperagun.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/53354753419.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/52665344987.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc8030a37e---kikop.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/15762295185.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9c938733---89904385039.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/37610673228.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/fiwufujomebeb.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210923_94A49643877D9AC3.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/8896996854.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/64813002011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=trip+movie+mx+playerPDF 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_off0000bfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 10288 bytes
SHA-256: 006e28c22a28cf428ff40db9111236ac6f5a1e0ff37737f589a5bb1aaa7c1384
font_02_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 20144 bytes
SHA-256: 5fac9a8e52e6289f3c10e84087d5899f445602efff11b6746377e2d5f71dd44c