Malicious PDF — malware analysis report

Static analysis result for SHA-256 7519c0952e00f5a3…

MALICIOUS

PDF

74.0 KB Created: 2021-09-14 05:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8deced27952373239844a64b6946fcce SHA-1: 07ee71dd9c76f0f65a29a0e0fdde4b226ce11605 SHA-256: 7519c0952e00f5a3b516356af1f17d1cbff8caa6ad15eefbeeb4356891be35ed
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the nature of the URLs and the PDF structure suggest it's designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://contrast.no/ckfinder/userfiles/files/lepam.pdf In PDF document text
    • http://byty-pardubice.eu/UserFiles/File/lirorojurukunexageza.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/suvise.pdfIn PDF document text
    • http://dezis.ru/uploads/files/gapoteze.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/84162151157.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/50233626851.pdfIn PDF document text
    • http://contua.org/userfiles/file/wizatekananofepegi.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/bawokikajo.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/detofox.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca0ce0d650---dabetotej.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16132e688a50bc---nitogitow.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43518927043.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/jojufilukadolunu.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/bilomupelazo.pdfIn PDF document text
    • https://o-dance.com/upload/files/rovujuf.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/fevuwem.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137de1dc428a---41676196303.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/43193675927.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/gavefufototedubezix.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e082f81496---95582844205.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/9774151531.pdfIn PDF document text
    • https://bdata.vn/upload/files/wujudagixilabutesanatezi.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/29929837687.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/13652099474.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210901205236.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210905_014803.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+hill+we+climb+amanda+gorman+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_off0000bd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD58 17532 bytes
SHA-256: 9c658d1226c05ed172d88463fba84ab97b31530432a78fe0b20919ec40f2e044
font_01_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 10988 bytes
SHA-256: 47b7b04856ee0da019649ebb063c6c8a9653f9d745e03e4ed9a906bfd1cea01b
font_02_sfnt_off00010254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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