Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bfb158ea23f253…

MALICIOUS

PDF

78.1 KB Created: 2021-09-13 19:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea683ff7caff6e0e2979652e0cb40395 SHA-1: d533099600965f4a459b9979c6dc123f01de6828 SHA-256: 52bfb158ea23f253c3b316f35c1d64c5af6cc4a868bbc31751cf9a2b30ec50d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to various domains, many of which appear to be part of link farms or compromised upload storage. The primary function seems to be directing users to potentially malicious content or phishing sites. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=clouds+and+sheep+premium+apk PDF link annotation
    • https://ebooksweb.net/files/file/pijer.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/20091732203.pdfIn PDF document text
    • https://korankertas.com/contents/files/dekikolutomazowisilezax.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/nuzipuvelafudibivu.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/48103653959.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/nomuwajixiginun.pdfIn PDF document text
    • http://myslizdrave.com/soubory/15163753954.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16133e9641615c---50516701586.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd8050af78---62184666223.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/89260430928.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16308982745283.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613be059e6879---83366416874.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/91656436430.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/bukazojupe.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbf377244---binagiju.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/fogin.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2690b8d27d3cbc72bcfd5263b7098f29/bifugareretosal.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/76e116cd7d9bb33c58f5edc2ab8a3f8d/voxirebi.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/ribuxadadag.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/fatabemexerefuzu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8113764a4---61209871360.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/kegekepebirofepiko.pdfIn PDF document text
    • 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_off0000ca50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA50 18292 bytes
SHA-256: 339d83b66c2688fb15f1892aad20e4ab109cb3c083c1914855b3a384fc38a77c
font_01_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 10780 bytes
SHA-256: 6472b8ddacdae6f33a8664367ca3fe465e641f8a1473c54f910303350d00018b

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