Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6dedc3959f798f…

MALICIOUS

PDF

85.6 KB Created: 2021-07-20 03:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74617b0a636fc82d26d08865b3c49322 SHA-1: f9b1bca5f29dac5b57582902bddcae7df2a0ad05 SHA-256: 0c6dedc3959f798fa4bf8a301b26f2521010f06aa8d0741fb2667db1ec45d779
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ba3c79ea1fd860615ee2ce927e035b48/kotopepigutezulu.pdf In PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/33200473660.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/nrgi8mvkjubehofpdm381hssj1/90084601923.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb51b00d78---lamab.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad754641a---rifegikojulunanojom.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16095d8b57ff59---bofudogazanuba.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/zafevuputaluvuk.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/gifefarezaruj.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/8df575d969af9d358bd4a0c40f265312/75018475142.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/sejaxapaz.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e1108ccab---1821948772.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/dezosijevigifozeji.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731ebdb33f8---zibopirokatevedepujazez.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/r2liuqdjmj4cit4ff5tmgcte15/xapanawumakoxuf.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/15887459129.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608649a5625c8---39366652964.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/37396859692.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/gro0empnmdrfm4dbv1sbdck3lc/54674800617.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/48b09b76677fe48e57106b1a92f61b15/datujojulov.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/098915d1dab3e1c89d9a1f22e1ce2ec5/xixezalimopuvowuxigete.pdfIn PDF document text
    • https://akvaguru.hu/user/file/45267532169.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cc48dbc06---romijogusemapixupix.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/3720785c997abdcc0ff117e2992246c9/15033540888.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a02ae12700---1004688157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=american+express+stockPDF 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_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 10664 bytes
SHA-256: 6a678283c6a88d7c941fbf49fb3232f2d8d34b8f2ee7fa8d6ca8921c58aa4393
font_01_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 18152 bytes
SHA-256: ece0a53aee9f0ccc595849f2ed9f6d1ba873d030ffa2f10bc5314663cadc04db
font_02_sfnt_off00013161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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