Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c11a51c56da0d58…

MALICIOUS

PDF

84.5 KB Created: 2021-07-16 01:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 141b0d55ffcf2ae43970b2edbfe26fe1 SHA-1: 18d0357da748e47fa14fd238ded232c0f03911cb SHA-256: 4c11a51c56da0d587c4f07bf0ec94582d74d05d79732f4feae3555cd1ad8ac51
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.2122

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.
  • 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
  • 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 https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/dd3pevq94nkkni4cbjvti81jnt/rubenapibefawotuvoti.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082d0be16f84---82017887118.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/96377753219.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/p9mq3vkjh3c96q9jjbe236nm7k/58820511405.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5dd466f81---wawimubarizesakadoge.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1e2a8549---xadebibun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081211b0a1c3---dokoruvolana.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/12076138523.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/4246vc1iueupdb2f106a46iuo7/nudererapaxejowukozaj.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d6352ef0328da853768d112d86648a51/79804226823.pdfIn PDF document text
    • http://abnicum.ru/files/file/gukod.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/93317766020.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/gitinekewogap.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/89630548252.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072593c53d6b---26548905104.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/gasorivenazurawajexoriz.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/basinesod.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/kalonobaxobozineva.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2dcb4653445a3104f550dc5db9582a21/64621077536.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/59868099655.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/73831899555.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/migerixef.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6a61192e---45872403608.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/xabojuwog.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/nepewixabaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sylvania+rice+cooker+instructionsPDF 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_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 16824 bytes
SHA-256: 54e1bef55b1dc587f3e686c480a31cf5349bf59f4222d1fb0962b05cc68555dc
font_02_sfnt_off0001358b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358B 10668 bytes
SHA-256: 94c74253d626e36295b4a56e369230be677405f73ff2bfc6a17c927fd7db8a70

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