Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c948ede402d717…

MALICIOUS

PDF

83.6 KB Created: 2021-08-31 05:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 895d944d56beada6c171b48c748ca8fd SHA-1: 2ccd0c3c00e65d0872c44daea5a6de41f8e91e78 SHA-256: c2c948ede402d71764b0892e8d4c21401e55529b568adfcbbd499fff91082797
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple unknown URLs, many hosted on compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF itself is the primary lure, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715ba11c836---3366693463.pdf In PDF document text
    • http://gptools.net/userfiles/file/7274223783.pdfIn PDF document text
    • https://papiratisk.cz/soubory/wadogukixilidowakudan.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/nunufesunonofetajisixed.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b434617e9---vejidozojubob.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/29355777707.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/2810950618.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/pukovujixaxused.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3f58c77bde1cba2fc8542cff6b44ded2/82533394818.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/71539990259.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/5006170966.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/zexuxep.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/97202810810.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc472b4318c---fuwatogonan.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/tinemel.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/xizafakenuja.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/50413102269.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/sabome.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085b00921318---lirir.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/24313376448.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5574678cb8---jilumonebadefewela.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/dezovixu.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/25250042067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=phone+microphone+frequency+rangePDF 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_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 10976 bytes
SHA-256: 35212f365fc8b895bd1dea63412375aaee31d53e101b924f49fb9a43db2f6edb
font_01_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 18044 bytes
SHA-256: b3a12146add74f269239adce3c65d7ede4ac11b31b47b1781ee55042511c24e2
font_02_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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