Malicious PDF — malware analysis report

Static analysis result for SHA-256 45109a20e38612dc…

MALICIOUS

PDF

106.9 KB Created: 2021-09-05 11:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd6c10add12cc386fe5a3aa03d064a8a SHA-1: 641632543da1f1ed8eed0dca095f33ab238dcb66 SHA-256: 45109a20e38612dc8a81f1d84e7a5b66d788473d5df7675c3e0d9144d026d271
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://joesservicecenternj.com/userfiles/files/17911818687.pdf In PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/xotamupenutowomubote.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fl25rh0js6ce8e1pn6jeslc2mr/fonabadilafo.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/zasojijakakupupo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/7a599e2384de78e5990340d91bf6d3ec/fubizebolebiseza.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea9ad7056---64520631845.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/70907159812.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c3b39d826ba2f202d67d2acddb14243/medemujomowivijinarinod.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/muvozokovuzuritalulosig.pdfIn PDF document text
    • http://dnepropress.net/files/file/vonujuwuxezodizokojug.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/juxatanilu.pdfIn PDF document text
    • http://inercial.es/uploads/files/ronogopopapenapafimoter.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/kozazolon.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/laberonadutedula.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/sozamiwigugexodumilidesas.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/58335046628.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/bofigafe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fcee25dec---46461476755.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f448df2a02---daxiruv.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/35097068730.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5ca2ac13b09279ff55e780e337a95271/mezebefapawaripavogakewu.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/48001035956.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/dc6b7bd7935dc9e1731c299402969ddd/99271887756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=principles+of+marketing+chapter+7+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off00013959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15170 11208 bytes
SHA-256: 579aff76513acc19229fa9d441aa581e0f3a433dcd6bb3bf02cf4e76e3f97f03
font_02_sfnt_off00016b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B4F 19208 bytes
SHA-256: 4e92e989cc1acd3bc4f6eb7e0102567be23c09d80860ce0f49ad951899e5025d