Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c59a866a76ae19…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 01:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 446620a1e6938b65ab05a144ada9718a SHA-1: b480a9633736bad2b4785377d9df57d8cf655994 SHA-256: 66c59a866a76ae194c036ac1e22b1ef5f120a5dac07e0c4adfe1d281af269902
176 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to numerous external URLs, several of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a raw IP address in one of the URIs further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://theipbuzz.com/images/file/juxafiburerubu.pdf In PDF document text
    • http://fritz-fahrlaender.ch/download/silala.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affcc56ea45---77959586134.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f31c1d6e62---54612483280.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/nekufit.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3979fe3e3d---wilitak.pdfPDF link annotation
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/fikevum.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/21622691376.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/4559808069.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1qajd29h27rlqfpu2diod4s7r5/nexoputabiku.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/tutomuxijaxolega.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/40545712670.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/49578027501.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ed6573cd9---gumobivosif.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b746ca0650e---zanoxi.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/koxatox.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/43896069071.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/gizegetazesifolokegodov.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/seravegenivakumawaxemes.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/vugetaxari.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cef795c8f58---jafamaw.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/jebefidabu.pdfIn PDF document text
    • http://stroi-sistema.ru/img/77790371105.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/36135498849.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/nuzisijotut.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/kirame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lakshmi+pooja+mantra+pdfPDF 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_off0000b889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB889 17036 bytes
SHA-256: 14854d879a8e663630fda786a49a1336e6b0def76134c5c011fb6e01ab4a5aac
font_01_sfnt_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 10764 bytes
SHA-256: 68b62608cdf0ab1a8c072e8baa2deb1bf77855854210b18acb6b14f7bd0ab114
font_02_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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