Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58a7008a271841e…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 11:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6827588852336bd680431b05824347c SHA-1: 0718d6cf972642acda52a0cbbdbb9c0783548ed9 SHA-256: c58a7008a271841ea14142d3d4db679e3fb54b1ce5c60db04006edd081b84b82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, some pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vin-baietii.ro/ckfinder/userfiles/files/43935805333.pdf In PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/805484667.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/soden.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/2579244213.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/mozirerid.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/86317051848.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/gixezikubi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/8b74ab8d90c3f18a9b5596798d74b634/rametafadibupo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16145e88e8a1ec---9804342231.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/zuluj.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021922114262217.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/50676144099.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/laxigij.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/teloluvujunonev.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/867572610.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/kozonapipibunodurobel.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/45094218656.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/cjm0cdqodqco234qotc3ni2af5/sutijasodizojiwunezefo.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/momebojirebakugoxuwa.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/29134756074.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902064505209108.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/gigameto.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/88201112547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+download+music+from+datpiff+to+androidPDF 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_off0000d390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 10828 bytes
SHA-256: 6b4bcbd9cb6c4d778fd61832f4d3025a6a780ba4d997ff323622af02321a0cb0
font_02_sfnt_off0001049c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 17716 bytes
SHA-256: 701a9c47dc2d293cd353fa1ac0ed5fb21895f343cc3f29b5ee6b9b16f7585c07