Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d126bbc704a149…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 13:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7dd32cef52f9249f230e1bf4d607916e SHA-1: 86c18b67cc89741fc54699adc5a9907369d4dadf SHA-256: 87d126bbc704a14931ea61b5119fffa140b800877cea39d2b451fa39d3cc4c50
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links likely lead to further malicious content or phishing pages, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pelicanfinancialnetwork.com/ckfinder/userfiles/files/7008358132.pdf In PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/zogurarugitujuriv.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/54861025236.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613f31b2bc4b2---benejavuvoj.pdfPDF link annotation
    • https://grup-insaat.com/userfiles/file/33544439517.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/66535802362.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/49577304729.pdfIn PDF document text
    • https://sergiomauri.com/images/file/19239990850.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/bukoneposinisupiliriju.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/11597902081.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/xaditapek.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210920_222248.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210915195339_s1nizd.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/36429747940.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130be9f0eda9---perafirabotowemunuti.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/jegubitizi.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/10759172468.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/xelasuriga.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021092115571273499.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/deporutorusivo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd35452cbc---serageximuxavarisuxojose.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/88745088527.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/cd466152ebbd6e054723e7a6a40de1df/76577240279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+zooper+widget+proPDF 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_off0000dc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 10548 bytes
SHA-256: cdda59e2ef4e72fb40490888f1830c24a38bd5e33027af844f42242dc791d4a3
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 17524 bytes
SHA-256: 43e329e29f5bf1af083dfb71ff27839c2b29ffea66b20b3f40dc403490fe2eb9