Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b74140a6b27add…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 11:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 58ea2172c140ae8531e25f24407ce438 SHA-1: 9b7692f80c0a6f70a06cf84e6422e0ebc421fdcc SHA-256: 42b74140a6b27add9af2b148577f88fa7941c93df47b81ceb8377a1ed7a9dacd
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute malware or conduct phishing. The presence of a 'download button' heuristic further supports the malicious intent of luring users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://33mobility.net/uploads/files/16316126152.pdf In PDF document text
    • https://lee-trading.tw/archive/upload/files/45095065841.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/25098475390.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/aa466e5ed554dca294eae42e6fb749c6/90685414204.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6954c8c849aed61d43b1d9ec64f7b35f/74615333171.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/26f3dee6383c63bee18563fd529c2c1b/5444792509.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/766e4e2525afe830a4815a582612cda5/84236527429.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7e9eb321---simume.pdfIn PDF document text
    • https://x-software.cz/data/file/80711711516.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/girarogutajuxiwug.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/19050715615.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/47kqsvndkek6m0ugc091l4asa5/94576254426.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/1643694545.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8d0c311decc2467b84cfada1b7986d48/xizizasedidazisolelabefok.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb183b77f1---54341466177.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4c19254548b31f6c5f27daeae364215a/gaxuginoxi.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/74965143865.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/62889725942.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d9d233f8a1702ce7eaf919004a4871b4/23987863753.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/59530636122.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/negofuvusasajudugel.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/7cii1bicktnh2bmeq80frunjsq/968368457.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a417cfd1ba434ac144da353debcbcbe6/51390460485.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/62693380191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=stronghold+crusader+2+pc+game+free+downloadPDF 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_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 11356 bytes
SHA-256: a7c88cdd1c0055e9051da2f054c6548c6a240abb962ac30ea8c6322efa449c66
font_01_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 17048 bytes
SHA-256: dfb63132ac421b11839f5242ca275e36ea81cabc16984852818d00a1c0d7aa57
font_02_sfnt_off00013f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1