Malicious PDF — malware analysis report

Static analysis result for SHA-256 693c0586db09c404…

MALICIOUS

PDF

69.3 KB Created: 2021-08-12 04:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d91bf881b899b156e9f50d89f66cc50d SHA-1: 0d7b4f124093abf13359bc8c9c49ffeadcb088d3 SHA-256: 693c0586db09c404e91e047c090b7417df3f70bd0a75cad69a748c60d7fe6b49
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'compromised_cms_upload_link_farm' heuristic suggest a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7776

Heuristics 5

  • 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
  • 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://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/2edc10e3f0261b7828333346bee920fe/fetejinuniketibe.pdf In PDF document text
    • http://www.bash.cl/media/file/86348230379.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607526c151e33---xakuzenefozevefojelaluka.pdfIn PDF document text
    • https://5uempat.com/contents//files/fukej.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/95667015066.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/26542061511.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6ea262b2---lapofuwasogevanosel.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/962281e8b941de05ece9e328383a08ce/tetuwoz.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/83488401102.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/tubebubi.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210730010015.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/734b45a05e040b6662e36c440dff8466/96360908323.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccad9f08f6---jefirite.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c547728af50---32474746567.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/61895205596.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/27595690623.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ea40ef9a1---xigejanazifixufoliber.pdfIn PDF document text
    • http://bienbao.net/uploads/files/38522333454.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/vunevuzapatijamano.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/joptktnb0ohh998gddvhntf7s4/fenodelowiviputeg.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/pfjg4qiq1ulf0cne2gfqhlqplt/2788352343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=is+there+a+cure+for+vocal+cord+paralysisPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 10844 bytes
SHA-256: 1002216455a1da668f3ed84fcbe1fea45572ccc4adb4969f28d8bc23402c9234