Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa051ea297ff24a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 19:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: def02a8c0945f6baf0543af0c4e9e1aa SHA-1: 726bccfeb639b2b7d6dcd61c9d9beeca82cfb1ef SHA-256: 7fa051ea297ff24aabfb6b6ae889171ce1344716becb2872acf37fcac2ae4329
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c8db3417b9a731d61528381a32ca4040/befapuduvupuxubitix.pdf In PDF document text
    • http://goref.ru/files/file/zupadabinizazozu.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/77567906177.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/5984108083.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/lopafikifonozinivusogexap.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/pomanubufadowupesowak.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/52869055614.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f169a002ac85af465f51c629e5a08327/48335355445.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/xerejuw.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1d8846298---lugibazo.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/favilaforebosavaki.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/72052363888.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/zumexamarurumuratetuto.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/67826012315.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/61519510591.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/37618825528.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/lodumetesitokutuwasuw.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769386154ac---bibiputevuj.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/lopevek.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/vemaperimugobopu.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/65995848343.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160708ff09a04b---61935376517.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608825bc3e07c---85907044549.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/nokivibijiki.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/kegopazobidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=srs+for+tourism+management+system+pdfPDF 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_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 16264 bytes
SHA-256: c4d0593135037e90f81c8a77b3d0c0e847fb39ae08ccd6491ad7d716eaea9515
font_02_sfnt_off00011add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 11084 bytes
SHA-256: eca16b718eaec1ffc3c05608f4023b3a9e090bac080d75a2bfb5bb8d399e917d

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