Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cb917e15f810f0…

MALICIOUS

PDF

118.0 KB Created: 2021-08-01 08:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c05706f6b5d87e21eccd5741f7a0bef9 SHA-1: 72b355ddf02519efbecd61a6eb55835a7c1d93b2 SHA-256: b5cb917e15f810f0c907e663ddfd17a05795004128b8430b130134108ef4b48d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as a phishing trojan. Several heuristics indicate the PDF contains a link farm pointing to compromised CMS upload directories, suggesting an attempt to host malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3804

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18ae095cf8---bemixoguniruvi.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/aea48fed90b0e96074f062b568b3245e/paritov.pdfIn PDF document text
    • https://sce.tw/uploads/files/6100384687b57.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210704170350.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/29364191733.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722db2c2c00---45246805003.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/93359919394.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4257e1d181---49962002322.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/h138c03tueh34g2k0pvfcqabug/4675003538.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca34c2b559---damirenelifunakivitu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16097f7614b507---53483695117.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/dajekedu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80e7504e0---34575143984.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/75306633161.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1c06f0252---jizijivikorawuroxorajesip.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/98957020604.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/47476583283.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ade8bb44d---54692544261.pdfIn PDF document text
    • https://ckmandarin.com/uploads/zetunivetifizokemop.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/78f4e7ba17c5ed8cb537614133023d69/ruloval.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1hedaqpt16073r3ofqcfvmnk8p/38488889058.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0079ed2db2fdcc8076ff535dec6c5ad5/xolinifukodo.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16091bbf685207---bavirexigamesepava.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/e0ms3s2a9rbv0hk5pvfvg380f5/juruzopomajoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=skyrim+special+edition+mod+listPDF 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_off00017a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19291 18636 bytes
SHA-256: aa32c61f2b829ab297c4296ed40efa279c3aa985bcb99880fe28b08f8a684f08
font_02_sfnt_off0001c3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3E7 10956 bytes
SHA-256: 032336506dc53c71a9acb298258d7387af802d86ddbe5063baa0af43d7666228