Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a56d82f63d27376…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 12:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f73773b3efdd61e5ea1cd04b66a1d178 SHA-1: a9811230d671628543dc85f88f9a513c3b50257a SHA-256: 8a56d82f63d273766c87831582f579064581d5226fc99dc926b50bd6c69dfcce
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of a QR code lure heuristic further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=laptop+qr+code+scanner PDF link annotation
    • http://sportingfoundation.com/uploads/file/13316227790.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/rijigaselovenenumo.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/68562074346.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/lopabezu.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/64957474797.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/77240828927.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/96350213580.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/99d05740ad2b164e3e63f7e36b6c0367/21311064874.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/fodewaxopilaj.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/nogazuba.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7069734590458e5803d55888e7b85b7/ginuluvuzomupajigelo.pdfIn PDF document text
    • http://dsraxys.com/uploads/12531355996.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/fivexapokavu.pdfIn PDF document text
    • http://vinmexindia.com/uploads/94391097435.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613491f566ae2---rifiwowapepogewivirewexa.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/sidupedasafilovam.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f650c2e51---lopiboxok.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/6516036706.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/63923761069.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/lezoradisa.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/03a28a91e47bfaaaf56fe1745ea01ad2/44521634426.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/51354214176.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/75404988731.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/92613763224.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/i4do1b7bn37ug90bvdg4fu1gia/13872838935.pdfIn PDF document text
    • 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_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 18388 bytes
SHA-256: 62a244b6b1258f15ebb0100d28cd17bfb002a6bb18c0c0d7b0c0eab643e72759
font_02_sfnt_off000122fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FD 10472 bytes
SHA-256: 3af3169ef22286d2aab88028d059fdee1d3c6a288ee59200bf65cda0073b20ef

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