Malicious PDF — malware analysis report

Static analysis result for SHA-256 48182e1ace183d0d…

MALICIOUS

PDF

86.1 KB Created: 2021-07-20 10:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e015f1cb4dcda0e8bc9e807daaca6873 SHA-1: eadf0b56d32a004c92abec8dceda50825bc0a367 SHA-256: 48182e1ace183d0dbc3655a899fa4a9a8e0a65044ab2a4c1e18df095993f5942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://vswet.ru/f/20530194682.pdf In PDF document text
    • http://ecohost.ru/pics/images/file/fidobikuwugawo.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/94921028184.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ef734ab77d4675a3aa6c6803bf842e23/kixutujarepure.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/74964240917.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607345635ad86---taxat.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/xebed.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/84212427675.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/6483273608.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e266b6123e9---parikiganagasutib.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/wagufoxemotowasubaguz.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/rufifetumarojesawijakowu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lekuxim.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/fujufomawaw.pdfIn PDF document text
    • http://jucal.es/images/file/40870229902.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a0acb35e---8469798251.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/ac1f54024b4c81308b813badc1b484af/35293428406.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1ddc16f6---revoxaj.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c704f234---lodukivowedig.pdfIn PDF document text
    • http://aimic.com/userfiles/file/fodemawirubasog.pdfIn PDF document text
    • http://daebokjungdb.com/uploads/files/pegazabewodikiwaboxapavem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2f67bf51c---soroko.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/29853896911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=indian+student+resume+format+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_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 10664 bytes
SHA-256: f3af56c5b3ce641ca165f1d722faf607cc45f8a3a0701a13333ac1bed38ea5af
font_01_sfnt_off0001063a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 17240 bytes
SHA-256: 655db155d068f7f360b4da449b0250f041dde7a648e2ae03e9ecb3f845dca66a

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