Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b08e9ff5828699…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 14:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9d46ef7a219723e9276d1fbbfafd479 SHA-1: 4109769eba07ba312f5532cb1ca99b9ff1773d79 SHA-256: c8b08e9ff5828699fa024e696ec50934f6d70228d3b48bcb2ed71ce75aa49917
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms strongly suggests an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pgprojekt.pl/Upload/file/14908394979.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/d6s1pfknogbfnj5i961abnfvht/1958667461.pdfIn PDF document text
    • http://vipdiler.ru/files/file/97025481532.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/11661162908.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/widawitipegajubavogi.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/vixofazuxiduminotododeb.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/lipotobemu.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/94302200706.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/79858086602.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/40626802502.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/tinakumugenasemiregono.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391920a93b9---runipefanajanadaxu.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/69226705760.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db6ebb3ee---tobedes.pdfIn PDF document text
    • http://erictex.com/ufiles/files/63864352049.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/gedetoregililusotaged.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/weritoxabevedigozozaxet.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/33806755370.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/34464397198.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bipalanafulibenanufojulo.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/jovubevipej.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/sudejibamorodefaduto.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/vawatuxaxunapixuzafeg.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/70761871340.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/sofunowevusuwirejenagofat.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/gezokudoputax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=happy+scales+app+androidPDF 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_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 10512 bytes
SHA-256: 833a0061bb55d7f34b36a887c9eb4477d6e32fb3196bc98c260f7d2de124f2a4
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 17084 bytes
SHA-256: f171d53545834a918b24b5b301d30db8a6a845c1e247c9659fc1498c9b1f542e
font_02_sfnt_off00012231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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