Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd821f9bb7480603…

MALICIOUS

PDF

94.5 KB Created: 2021-09-08 02:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b2c43b8df460cca6c362c7d8d2eb611 SHA-1: 25ab333e7871ebb922433e4d3b162d96dd006c7e SHA-256: bd821f9bb74806030ec2738f9e732e4299366871b7f010d3a3ebcb05e7ebecdc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 6

  • 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.
  • 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://architettoangeli.it/userfiles/files/15454056922.pdf In PDF document text
    • http://pascalparrot.com/uploads/assets/file/bakifojomudevefuku.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/kefoduk.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/dilefolesef.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/sixidudose.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdec8e59e0---69115224111.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f014db51a3---welilifuxufajetitu.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/012110139288.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609894a1a7262---kixozugow.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/85062428898.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/xofedoruki.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/webito.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/ravuninuxuwufidose.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/9a280159d5494a561b3a25fd70b244f4/wevobavejiveramebowidi.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/21824322564.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ffca307d---42788214164.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/juzolov.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a7a919dc4---25913900265.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ae204686d---geduvaxovibovi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a114b7e1d---36311229435.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210814220056.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/46232274290.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160dd785f2e776---33227848999.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/85475728143.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/xiboderawifegaligeniwamim.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/memubagazekugewisakuke.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/62014856954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=salter+hot+air+fryer+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 17584 bytes
SHA-256: a86c75afa8826a4d671493f3b07cfe531ed7b9edde4fa7ae485d098485c11b63
font_01_sfnt_off00010933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10933 19676 bytes
SHA-256: 23ab6ff7f6283ee2c48ab24d3d01bcb6a8d4344417f9d04813d92fca72351354
font_02_sfnt_off00013b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B39 10600 bytes
SHA-256: 270ba668cd4a1fc1490c575ba83a63f6c862bd0fc42584ff12976f5f0377f08f
font_03_sfnt_off00015347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1