Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd0a3eb4ee7c385…

MALICIOUS

PDF

74.0 KB Created: 2021-09-24 20:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82c8997138a71bb99beea2b44853dab6 SHA-1: 926a6f767b2f9f4a9598cb66b587fb712a6b0148 SHA-256: 0cd0a3eb4ee7c385e83e326e368163bb1597f33b92d5ebfff7eea5553819f98e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a 'Pdf.Phishing.Trojan' indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135110416c53---47276409369.pdf In PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/64394001623.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/wodezorabivinixumoxem.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/50596156307.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/wedawi.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/luvoromogube.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16144366e4635a---84065096353.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/jijejene.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vj2lmg7fvmkm57c2lb14o4vufv/35236647094.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/bemesujakigoga.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/1161065200.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210913_2346F761EF419306.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/guxajurovejetafer.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/45971277582.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/niweditavaroza.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161425284e50ea---55820501032.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/vufikekopumo.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/49256802791.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/4568027279.pdfIn PDF document text
    • https://apra.pl/files/file/17588317840.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/xufezopa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aat5h2ur2j23dla11tm6egeht0/jelopejumu.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/jakewupogafomumexewe.pdfIn PDF document text
    • http://dnepropress.net/files/file/kufepanozijarigemerafo.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/lovuw.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/betolatopawijonumoweza.pdfIn PDF document text
    • https://zzwgjx.com/d/files/nurezuxiregugamuralikowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=watch+faces+download+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_off0000bb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3B 18860 bytes
SHA-256: f89ac3ca70ec67b53ede020b17a9256d23b71cc192dcc0859d9cb5dd3169bff5
font_01_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 10652 bytes
SHA-256: 5dee12f4fe2a307ad89163695b4099488b107922b4103ee1416e20d25f992531

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