Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfbd73b35033b91…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 10:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5f6401e7093f0fd50b60559abbd0cd7 SHA-1: 404be275653057a08ffe2eb966661f2016f8bdf9 SHA-256: 2dfbd73b35033b91024c8f9b4c506f1ceedd3298ffdd5d6f9d0e85230d5e86e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, distributing numerous URLs that point to compromised WordPress uploads and other potentially malicious sites. The presence of embedded URLs and the nature of the link farm suggest it is designed to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826d6d268e1---tixaratikikeboxa.pdf In PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/69431909681.pdfIn PDF document text
    • http://chromoink.com/updates/file/65076096994.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/57152928467.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/60246903257.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/70726896009.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607102832d8e2---38807238933.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/witidi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/33aa152d8982db07f990f59bc2c8a762/48698464750.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854de6eeb08---pirorosiremurukekufowu.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/bomojuzesifikexig.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c818e6df7a11a5230e6b966c9c17e8a6/66345006325.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wogexojulanelejadamusi.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/gasowumosirad.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/91878246926.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/tabukiwukojapi.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/68897665081.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/46533440735.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b9e43226a---veburi.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/99990742758.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3h6q9ht3l5fl6426q0hv0388n6/razolutilururepus.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/kusesiwuzupuwurezobiz.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/24955585201.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/dotexig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+compress+online+below+5mbPDF 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_off0000bc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9B 16720 bytes
SHA-256: da710fb70db5306a8b127820ed80a6b1ddccd45b0fe6c0bb6c7a54c5fbd71138
font_01_sfnt_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 10884 bytes
SHA-256: 62d09f1cfc07657ca2141545ec319acd956508bef6fb6eaf1275d705aab160fc
font_02_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.