Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a7c6e837dc3bbc…

MALICIOUS

PDF

77.7 KB Created: 2021-08-20 07:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 45de631ebc31cbe946c8cec443cd63fa SHA-1: 1bf531ce1f03e6b287afb67cf31540dd28df951b SHA-256: 71a7c6e837dc3bbcb8ba813a32da7c631e5957830f13335f68adf0ba29ff76d4
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to deliver a second-stage payload via the embedded JavaScript and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://svsteinfurth.de/radsportfiles/file/retizo.pdf In PDF document text
    • http://indianspringhomes.net/userfiles/files/fuwenamorizufi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ca7bee06---gesebitomutilora.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/maxewus.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/sesirazoduwenoxuwonil.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/7bd4ea576e53a9142de7cfd572634443/43789203890.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/sexudikisusezovugux.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcaad713bf---30104433957.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e2ca094c1---7238151848.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160d628551e1f8---pijopufipukuwegoguga.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/turigubezemomixejut.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-30/20210730203327899585.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/11776397350.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/nerevomiwijaxato.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd190b1fdf---zikebenubifinumetobadovas.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/dd25e33d091e3bd4d1ca2e56365a56e0/kimuve.pdfIn PDF document text
    • http://mid-europe-ex.com/44629776226.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/73925057071.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/witumuzosatu.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/sagojixidetevipubujubuzev.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097caf5a1c0f---nezodobisirumuwive.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f07124a0be---daraxevirasofew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=alfa+network+awus036nh+driver+windows+7PDF 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_off0000ca66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA66 16604 bytes
SHA-256: 79701732e03039b0a702415bd7428023819ebed1e918f39a9783726e7080463c
font_01_sfnt_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 11288 bytes
SHA-256: c519e7528f96b8a071adc6b8bcef8a67d57f68c6658bac0538530c695601b38e
font_02_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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