Malicious PDF — malware analysis report

Static analysis result for SHA-256 c165cf0c2b7d2a5a…

MALICIOUS

PDF

87.4 KB Created: 2021-06-25 20:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c27f49b78c27d64f5055d14c838c739d SHA-1: f723b49ff74001376a02d16a1b61d543c2d30884 SHA-256: c165cf0c2b7d2a5a63f3b62592285b3bc8fd053fa48ee78eb62b0f93438c176f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as 'https://drafthe.ru/uplcv?utm_term=how+to+take+a+passcode+off+iphone', are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=how+to+take+a+passcode+off+iphone PDF link annotation
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a335900669d---gowevibudinubopozomi.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/vu57j39orlek88fjmdh9rudsd5/33979950143.pdfIn PDF document text
    • https://aashianarealty.com/file/rizav.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3143f1fb26---gatap.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f73a71fd2---lujovofurazesevanebex.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/03db79394044e42a78e69266dea8beac/zagonipiweriviwazug.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/20075139980.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/39726220057.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075f88fb163f---4250901055.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd790cfc53---64239274821.pdfIn PDF document text
    • http://dentherapia.hu/files/file/90643071152.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0bc37ac1---fojejarugiso.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/4565425206.pdfIn PDF document text
    • http://ausafe.net/images/art/files/gowuzibevuzijel.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/riguwu.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/tv7k0d83alanmio0ls5ica0j46/54479990892.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/nojazewutebawifikegufo.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/58934498518.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/13425556214.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/54984716759.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/325102d908d026c5eb19ec42202e0bfe/51198179818.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/da919055828e98003a399a971f0b923f/riteziwixumor.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/parukafidilez.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ru2uentrkr5k7dco8oogvjbqcd/tusafuxaperisofemomek.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_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 10740 bytes
SHA-256: 8053a12d9b6ca230a6fd9bf0adb41d86d6882976d09d29b24b3e8626e2b35845
font_01_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 17408 bytes
SHA-256: 60cd2d1c0f1862b424484301e241f6a379575b836f2238a2784904a8d164a3ac
font_02_sfnt_off00013881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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