Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a66aa82bb337b64…

MALICIOUS

PDF

88.6 KB Created: 2021-08-31 22:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f739aa678b91c630a775d558e6f59267 SHA-1: 53710d563f01422c7f94a572dba5b21e7776d0f8 SHA-256: 4a66aa82bb337b64d7681ffb0ba64856021f697b3a6d629757d0ec0ef06e57ba
204 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting, likely to serve a malicious payload. The presence of a 'Browser Install Lure' heuristic suggests a social engineering tactic to trick users into downloading and executing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f821bd954---lumagomoli.pdf In PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/2290457376.pdfIn PDF document text
    • https://linardi.ru/files/file/kerunopidesomow.pdfIn PDF document text
    • http://emannsltd.com/userfiles/zavazuwiburozaf.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c51912e13f2---fofuzorojerinemerubulek.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7472d19e---72638265307.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1ffa508a3---rujebaf.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/sigodegatavozujame.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/34f2b9073d26b7b4e022edffc597972c/modutifimowalulosimedi.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/fuxezomafewalisibag.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/82103977777.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c4df126d4---buwerovosawapavolatomu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e12dce9e9---62218900829.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfb84435b---kukeviwir.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/2n6bruams6punqpnvupb9t0bsd/77258267780.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/5e5c925ede3c895d3492491ff3f400a0/paliwelufozus.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/fifategaberefanakin.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079b31eed752---60192302852.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1fa4aa70c2868eac6d843854180dbbfa/57638384135.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/faxixadimomu.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/98317342253.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c69b9a6310b6c8f06027e824bb351e39/bugegazoneso.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb14137d49f---ramajunegazerifoguteb.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/movebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=constructor+of+a+classPDF 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_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 10236 bytes
SHA-256: da632841c6a69d825274ddb2bcfa9b2cc95e0d68667ef3dc5e11e99717c5cf62
font_01_sfnt_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 18464 bytes
SHA-256: 1af2135b7dccee50509ac09f740425e4e09ece6ccc50a6d96ff13d49d6eeb064

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