Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc4fc6dfa113149…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 02:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d2d000bba0b1082ecdb29a6482b31f1a SHA-1: 86a3fa73c5d788dd021a2405fa3598a6f5423cde SHA-256: 7fc4fc6dfa113149ade5206e1cad08eee5f85a7a19157e5b0f6a851c16b81b3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting sites. The presence of external URIs and link farm characteristics strongly suggests a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ganport.pl/userfiles/file/52018399709.pdf In PDF document text
    • https://rjpexport.com/files/72214924928.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab46a81762d---11688746757.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/38gdj9t171gn88fftdajs5eaq6/90761386677.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/612f7e3622bb99f7ee76c7aa74adb91b/jiluwix.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/95703700910.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/ginupenadu.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/mewitajenemofi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608972abf1965---66958580633.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bc11b4e36d9c84b895841e382f14b2e2/80018563713.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/28616625174.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sh6ooerrcoamteipvt1ek2nuu1/pemurolukabodarolaj.pdfIn PDF document text
    • http://terminsk.by/pics/files/vaboditogofezowadapofapi.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/falibunobitex.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090106043073.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/jubagolobu.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/74481365990.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e70f9c257---17213034126.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e3a992f6e15c2708701ae8949ff740db/retajerugep.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/29602091462.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/736550535.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca68eb577---tofapokovavemeza.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16070d5d74ca38---39067675329.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/perabitajasosex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=kim+and+kelseyPDF 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_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 18244 bytes
SHA-256: defad1511288d44c47a50206fe9acd4ed691bcad08a981453d8ed55ac5a89c2e
font_02_sfnt_off00012ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB0 10288 bytes
SHA-256: d28c45ef6150bc7bd1e7738281bbc49976a46e721cbff24b0faf7e52f75d4cb5