Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8a3fa4179a1d5f…

MALICIOUS

PDF

86.6 KB Created: 2021-08-16 08:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d2af72d3cf94d523ba1512ec155d41b1 SHA-1: 33fdba0aef75a9a2ed30c43dfee2517d4f4abe8e SHA-256: fd8a3fa4179a1d5f5fc596ce71c773aef523ede5fb870cc88e7d2e8e594a87d5
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these compromised sites to distribute files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a7da6c89a---23659421806.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f20c11d509c2c541465a04e9ba7cfb70/fekerevilu.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/21609539502.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/50742468410.pdfIn PDF document text
    • http://rsst77.ru/upload/files/guzesokekikevegali.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b04ce2f501---wegeteropipum.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/pozakebewapupisafozofuvo.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/5609650661.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf3e29048---73981215816.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e85228d9945---37378612299.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/5c94c3a7c11bb0c357163dbc352f85e7/dumikusewupi.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/kakixojorerotix.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3f4815ab7e030deafc9849f28f68d099/wazudoka.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3ec74e047bcbb7733e519fb83a94171b/56169003907.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/f978b626439c1519eb342ad0c89d5cd4/54822529525.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2516e2d6250fded887d7c4e90aab97c6/polozo.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/11091376504.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/e4cee3f687dd3174c1c76a1621889dd7/zurufi.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/puwebu.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/losodomamoluwulek.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/aiho5qqq7vos832sbrtqo7kilt/jujemametikiwuxo.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/kq6lhlh1tbq27lnifnkkhn4i91/rizemipirezizufijovibol.pdfIn PDF document text
    • http://chongros.com/userData/board/file/10438708516.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f5bb5a1e466b8f9acf67cfc5b3930e8b/rujexezusunofewajov.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/vedujimatirixidiz.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/bobemadiraxinatimarefe.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609182488110a---81035019647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mahapatra+sir+sociology+notes+pdf+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_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 17384 bytes
SHA-256: 186a17bef1e53ca793277ea83761992a42f395d1b124bea5e4dd2a49ab7782bf
font_01_sfnt_off000119ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C3 11092 bytes
SHA-256: 7cab2cacf323fec04f5e13c25319a1195c23dc4335ea92ddbd8cad65334c0131