Malicious PDF — malware analysis report

Static analysis result for SHA-256 5726dc0ddb78cac1…

MALICIOUS

PDF

62.9 KB Created: 2021-10-04 10:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ee2668b7016aea7da1f7b2d9ad2c1482 SHA-1: 1b8c28faeb07d4191da56e0e436a7c7c08836631 SHA-256: 5726dc0ddb78cac1a411cb429c1e2860fcb2149d0c6505fab7954f227196ff5f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The presence of a link farm suggests an attempt to obscure the ultimate destination or to distribute multiple malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

Heuristics 5

  • 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
  • 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://covina.crazyrockinsushi.com/uploads/files/41369840471.pdf In PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/naxexemudodijuwaku.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/18258263650.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/potumaxapo.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/pemolagisazatizega.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/26847527840.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/wifunelidatewufuxeson.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd8a771bec---93840714320.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b852d234c8---5138593066.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/wotawadudel.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/wizupabudelusavepeje.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/liwitevopiderizidosuzi.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/21333186076158a954491eb.pdfIn PDF document text
    • http://elskenecologie.nl/files/pozupiwesif.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/46863068204.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/kefubikaxaxixevoge.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e304ccadfc7ed55a66af51adadb27d4b/dezekamisew.pdfIn PDF document text
    • http://nhabe.com.vn/ckfinder/userfiles/files/jiputepawigomenilanalu.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/21206764156.pdfIn PDF document text
    • http://strap.sk/uploads/files/35692715058.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/devijexapikobosubeze.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/rapurofevixi.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/mipatolufositezomufepoxi.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/57418390481.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/993522b32a66cdbce9b6e4b037ff7aa1/jenusapivokizupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=iron+and+steel+foundryPDF link annotation
    • 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_off0000b0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E1 10420 bytes
SHA-256: 78e0018e723e24d2cd8673186a75c27373a256cf3f2fe67b09ad0f1987fe64e8

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