Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e4aa61d1a09a36…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 01:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8952778e35dacde3a3e4597817bea847 SHA-1: 89db0c08953e42a35d23289d3387969421468498 SHA-256: d0e4aa61d1a09a36a3954142a25b149146d9fb9a51dc0987b0da2642884223f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ofcourselc.com/admin/uploadsfile/2128854284.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137c42cbdf8f---51348408580.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109071148346287.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161378fc0da537---82870686504.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e93c922800b5ebef6798f4135331ae46/lugenirerinojewulirirefe.pdfIn PDF document text
    • https://mkontroll.hu/File/ganijigiba.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3ea624a9---28832037338.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/42556785663.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/vamalazino.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/duxefanepitafaren.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/jelakogufapotedixu.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/jozoloripufinanes.pdfIn PDF document text
    • https://phunhai.net/upload/files/72033891701.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613848343dce1---68546625474.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/gowoxozel.pdfIn PDF document text
    • http://ihdbd.org/upload/files/12567632675.pdfIn PDF document text
    • https://123natura.com/stockages/files/86347865574.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210903_5C85EB57EBB2B1EC.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/vedariv.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/rojaxukunavuvelejuwone.pdfIn PDF document text
    • http://sung1.com/upload/files/fiteniraluzep.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/jubosozelovepifovil.pdfIn PDF document text
    • http://fteq.ru/files/file/41204849519.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/difitamasuxenopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=basic+physics+laws+and+principles+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_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 16384 bytes
SHA-256: 09c13c8705161c73fac9c4440a278f2d9a8f57a9be16c11a766d22b3ef2c785f
font_01_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 10752 bytes
SHA-256: cec74511cc31cc4666cc8441c105c55ffce16c65ba39f2ec568ab16a5593b25c

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