Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5c2012476161b0…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 23:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 080e4d746cf9b429c9396a0bc44a24ec SHA-1: 51bbd11e6acfec27d00e89bcdcb3c65427d3768b SHA-256: 8e5c2012476161b03ec53652f79c5f8198637cb10f74b97daec60dc44e39b3b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of these links indicates an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://solarexperten.ch/fckeditor/editor/images/file/16120875706.pdf In PDF document text
    • http://lubrifianti-auto.ro/files/file/39027749672.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/80467847428.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef84afef5---77771181330.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16080d552bfee3---57233727334.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/44eb0ef6887f55f74bac61d4c2303fb3/batawemovuxapesuxuledor.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8154c3c8a---82578916989.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073b2aea2647---84121816740.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/zetadunepisutu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/c8fett6aldo4789ssh8eqc8e0r/vojeforadekutuvulawawowo.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/97540060029.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/94868323791.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1535ec4753---52828850186.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/94733272727.pdfIn PDF document text
    • https://dm288.rs/slicice/file/1495212188.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429224721697653.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c7e7b085---fofapal.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16245026309865.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e0c65a0616fb70ea747ba605c57828bb/bojusitenivutope.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/55449444682.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1623401905971.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7d4b29e6664f6345ed268c54a4bdbe79/21087215260.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/c27530a41a2ff2396e05a91efe1199b2/koduvalipakadoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=german+shepherd+malamute+mix+puppies+for+salePDF 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_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 11004 bytes
SHA-256: 7cba634f959e59231c9f94433f9142af8cc0b296b8f3dd39b1a7ee77c45679b1
font_01_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 17120 bytes
SHA-256: b53fafa9bb1b4d13593136b0ba5ba604baccf35ae4e05d7711d04ee8f3e631ad
font_02_sfnt_off00013283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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