Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4c32d4e1f5ba78…

MALICIOUS

PDF

86.7 KB Created: 2021-08-20 20:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d8ce4729c5e938f698c1f3a8f03203b0 SHA-1: b1aa23e3f15ac703f9180d6f4e028d1f7872cf41 SHA-256: 5f4c32d4e1f5ba78afbc8a6278d3ec05608b62ce9ffd7a4cc4a074ec09a871c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests an attempt to redirect users to potentially malicious sites for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5621

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=how+to+level+up+farming+runescape PDF link annotation
    • https://castilloexterior.net/ckfinder/userfiles/files/zodul.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/27542912624.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/n5gs7hj5dplibscn4l15egn812/17449912615.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/69496896784.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607262ff792ca---39401080665.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160788c779df94---vanuvipalapegi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5654e4ecd---1047066535.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/60359854846.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/32i9dpdocu16jf0cf7rkhe7as9/keteroliruxiko.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lunudogalalokajibixat.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/7culscjujfg3pcin7rh5h5no72/jizimesuzirovatumidanudat.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b35b4a19d---55554132593.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/24827737846.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/74130059778.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0a4fc90e306b275145aa905ccd4a8fe5/60711386025.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/sozumukoketenavomusewetiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611483225d12a---12019490340.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jomcaua5i72rulvdaucgbq9hgc/wonaveluloxumifoxoturafen.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/jobofabitirosabuxulu.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/64344200438.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/zevoduxudakawazit.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/lutalefabanisenemazasev.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/nuboturonaseg.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607288f7054a3---97879608407.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608604429602e---86703700847.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/42794801240.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5c080fc65---41732914583.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBC 11068 bytes
SHA-256: 25b8a8ec6e0f9618ece4562ce2dd07b3571c0fd68a64efd29bbf503bc72d3e80

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