Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cd3cf53d773362…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 02:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b9f29d356deb009f46a01a819f9e183 SHA-1: 5b12d50f63d51dd7221269163b545ff344d2a5b3 SHA-256: d1cd3cf53d773362b8a085572a9c021488766131b0752e6af5fcaeb1684468dc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as phishing lures. The presence of multiple external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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=mama+do+you+love+me+book+pdf PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16075b26a5f190---rupugosimejogemi.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/fapilidebotaxilak.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa0b974fb2---13181270048.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/9bd4e8d56b6cc4842a1ee10b1f68f0d5/xeporonazewajisave.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9bfm8tuvi37phimmsnnatfpff1/ramovupa.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e593cf9b5129edbd86d52d9054109c92/gewozinitisepiz.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/1626009571.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12832422787.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da7a9e33fb---25275136887.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/86746189080.pdfIn PDF document text
    • http://info56.ru/userfiles/file/79790168346.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/62445f24696f43193ad6d7237f77a462/raxapetibesegatokobu.pdfIn PDF document text
    • https://tch.lu/files/files/42013899706.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a00ce8f33944ff854d333602f349fd99/84763556400.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/de64b3657156e90f05de0c81bf71cfe5/45465449552.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/zimifutaximiregobuxo.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/73383113103.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/41656274501.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/polukakobomiwezuzuforejax.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/23810923662.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/f8238valusf64ctks1qkp0j463/25735372982.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160770f16d0e5d---mudimajigagubo.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/451c25cb47a8c05745fe161f842b17ba/nixafulitojopamujaje.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/14249572952.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/4579757886.pdfIn PDF document text
    • https://nevisnews.com/userfiles/gijubebesevexuzewotet.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_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 10604 bytes
SHA-256: 5a33d194087649bcda5ac1132b27d934f2501efa9d36198f367d57d796a079eb
font_01_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 19240 bytes
SHA-256: 9e1e0f3c0a93644e25cc408b2468dc1c759f3e43b713ec59738a8f06ab278360
font_02_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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