Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9dac51f54a1a4e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 03:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f7f417024a4d7e6ba3f781ac8886f40 SHA-1: 02c2119e3922d74bf200735dcb0b8c82e8370e17 SHA-256: 1a9dac51f54a1a4eb3aa8ecebe4448b346575e89899b604a1137887c59ec5c4d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://portalbime.com/UploadedFiles/New/file/rubav.pdf In PDF document text
    • http://kovacsoltvaskerites.hu/images/file/buxuligoferemupagerixevu.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/jamugixorirakosoner.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/96574491399.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/81348449542.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/delavuxelukumodoro.pdfIn PDF document text
    • http://lgassociates.in/uploads/99842192012.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/bavomibudokenipot.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337088937b2---dusuburikagedosinulaxobow.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/pimonegoj.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161357c9f222a2---36497367912.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161332e2c8ae11---92497582673.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/wisuxekumenadifu.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/9811992552.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/90226367345.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/pijuso.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/vulurasabimuruxojomivanaf.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/27802400015.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/c128doqor3bda18hq98di27jlh/femameguvijevefakinegiwu.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/sazajeramaxewog.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/72580789655.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/wanogutiwekazaluvoworef.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9de15127---21868690556.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/82113117870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+hunter+call+of+the+wild+apkPDF 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_off0000de74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 18756 bytes
SHA-256: 19614b2ca68be1b1d5d5794c2860cf06d51d50445c64fad8dfe2d3810f5247a5
font_01_sfnt_off00010f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 10788 bytes
SHA-256: daa74eb53a6a98a784be5b8dbed3eb560d2bfbaca5142b262668d66cf3d1751e
font_02_sfnt_off0001282c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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