Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55fe2c9e0c5870e…

MALICIOUS

PDF

86.7 KB Created: 2021-09-03 09:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38e6a87ee02a51216167779cec392dfe SHA-1: 823ef0ef8bfb828bb8a6bb6a8a55d0adf2584a5b SHA-256: a55fe2c9e0c5870efbae5c2535852b3e4211963c1135a44ae1af22a0d7fc02ea
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous URLs pointing to potentially compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or exploit kits. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/50le03pk618p23cmkg1bm7dinl/wujabiwibeveka.pdf In PDF document text
    • http://ndc-group.ru/uploads/files/17730605920.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/997fd89df8d60391f5f5aae3a4ee6cec/3176574848.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/56641839233.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/panevenonaxusekuk.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d225e69be1---gakabonewenuluduxefu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607791f4816ea---dudomogemibifobu.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/xiwum.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc35cb67a---zokarerusotelavugi.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/gofodas.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/53275964750.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ko646oe4atuj7943afa62e99t4/35993043783.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/38067550997.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/lemani.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e410627b---63180633806.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/245d5533cfa7c2f59f73a8bbf4238b0c/43843523421.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/69d6260ac01d319f5b9bc18debc99f6e/98698682444.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8b6527a99ab7536a301fdf4a4a18d18c/75197299586.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5aaa39f33---zujurax.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/jesagekotarokikajiro.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/57612721280.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5cfa98ce68ff686eef0cf3d0a6b2deee/biwemexizatutidaluti.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/db8bbf0qcrh4ir00hjc0sj0ghu/31564656457.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/jivesopavuwutun.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/633006b2cc9df40b676c7521b67329fd/28132410889.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfc0dabf17---mezot.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/54032488460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pillsbury+bread+and+dough+maker+model+1016+manualPDF 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_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 11388 bytes
SHA-256: fab0e8bf2fbc9e5eed9173e3b289798089301bb9a0d9706c60841798ee09be83
font_01_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 19304 bytes
SHA-256: c1ed8e60cfe7a5e00bdf06e710206a69fb5cd0719015bfb2110d5df8895bb2cb
font_02_sfnt_off00013302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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