Malicious PDF — malware analysis report

Static analysis result for SHA-256 341307bf6068f438…

MALICIOUS

PDF

94.3 KB Created: 2021-09-16 14:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 41874f3b17ee97a12fa8979989fd526f SHA-1: 6bf683d660233cbd0291442e6c526ef582dd90fe SHA-256: 341307bf6068f438c40e10a02e7a75f401aef0a967aa82a82d7d32e4535d68f1
126 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The file's structure and URL distribution suggest it is used to distribute phishing lures or malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4098

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://vibrobeton.by/pics/files/89230099486.pdf In PDF document text
    • http://veganogle.es/uploads/ckfinder/files/wawexutizisu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d0ef4e494---vumoboton.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/42617746464.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/72dc7120a2b1c9a8d2c00b14e89c6dc7/rimeb.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/jirer.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-1/20210901121417437320.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/telizijerojiniweredeju.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/40379623319.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/21181468283.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f27aaacdcaaf4fb72972f0cfc7aa5934/pufaven.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/bokozasezojedup.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/nuxotifuveluxoruzoposonan.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/389q1eqnbku128aou9g8hc9r52/roviputivejanewivozufitub.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/62250326592.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210909_095145.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1veurrlen9qgdju64pmfte2gdo/lajevumisikokiladafamuvon.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/sivuwavin.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/deduporurulu.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/91100375568.pdfIn PDF document text
    • http://badgerhillfarm.uk/21271953373.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/83119395516.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161412a8f74a53---59183677462.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161373a6384fe1---sawujuneno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=streak+crm+android+appPDF link annotation
    • 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_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13103 10628 bytes
SHA-256: f16a975bcc0ce7a64a4c47ee79da45ceef50200ccf83a676f5e64d3f06a5710c
font_02_sfnt_off0001494c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494C 18724 bytes
SHA-256: d7b8c12d5cfe91d0564dc069fe91b32558b58f5321e4301905f8a98f20198251