Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a813b0556bbfc2f…

MALICIOUS

PDF

95.8 KB Created: 2021-08-02 03:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7ba54ee131b8a29d37642f9f0e46ba2 SHA-1: d00811b1f1cfa4ff20fa38a80096f720904b5811 SHA-256: 2a813b0556bbfc2fd3207f3d999eb4af17f71c63df159f8c42084d2a3f131d1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to numerous PDF files hosted on compromised CMS uploads, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of external URIs and link farms indicates a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://razaviota.ir/basefile/razaviotair/files/63309974279.pdf In PDF document text
    • http://palenice.net/obrazky_clanky/file/42449106146.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/2ss6bipm5kd3shppg9uq1ssc71/volunajuzulixim.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/wikekijeji.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/11740779971.pdfIn PDF document text
    • http://rld-carbon.ru/file/28509700444.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210616_C344C9513349E30F.pdfIn PDF document text
    • https://nada70.org/userfiles/file/3500551376.pdfIn PDF document text
    • http://nnhs1964.com/clients/a/a2/a2d7b74ded15306de89ee4bbe2f7ed3f/File/vasoxidamubinuvota.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/07f61c178ed99a575c6f7198b7e05c22/77754703655.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/899cc162bd5a17f7fc053d566dd86a73/fivenarojuzanibi.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a567999d3db---wixejatenaje.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/is02cktuotplni6ig8kf8hgmrg/zekekabajaf.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/sujujurovikineguvubukupa.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/kipufutipobatuv.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3365d1b5---28238091151.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/90p4ja4tp4ni5aqv8ku35gidgd/8034826478.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/923ec4058e7ed73f9cdb89f6ed00530d/33964728254.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/80e942c02e1f710d96d7a1b800f23a19/sezuzurokawuzo.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/38f071bee2b65ef3b9a1c54e2ba350d4/43832083671.pdfIn PDF document text
    • https://ijp2.com/contents//files/sitasonadexoniseworima.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/62863267202.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0697ea19acbfffce56c746631c5a0be9/kilamuxititalapi.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a931b540718003c65e079c9c1db012f4/1239208744.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/sametarasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+many+types+of+clothes+name+themPDF 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_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 10744 bytes
SHA-256: 2eb18e4de38088d56b3f1d7e38606640bb96b5d638d30a50d319e570cf6ca0b3
font_01_sfnt_off00012bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD1 17352 bytes
SHA-256: 30b90b9c5c4b3dab2a416de76a802b5558edd8fe6c895e460efe9a2e3e47e049
font_02_sfnt_off00015943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1