Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb8e03fe8d445d4…

MALICIOUS

PDF

88.9 KB Created: 2021-07-29 10:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 50e2e8beee3eed0f84751f86786fd4b5 SHA-1: 926345641a6f5b66e5bc4feec6dfe53830b5ec58 SHA-256: 5fb8e03fe8d445d47e3800bfb6bd08ca67c4489386aebc1f35a1255503d005ad
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d30f8b3a9e---ladisus.pdf In PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/wowipefode.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080be1567cf8---lanafixulolitegovu.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/88347641350.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/17648558975.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/86946265119.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/76383875273.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfec74adfd---lafopupuvoduzupet.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/desete.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88b0f798fd---jemuluritapimajixikoveke.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7d1u8apae1ou10cfg6tg43thtm/sojofozifukuw.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/31246d50c0cfd3cc2fa311019be99b52/37849375739.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/26602488990.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6dc1c8d60aeb0b1bac8a8960c6254046/4134773640.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/fb5ae9dc591bc3b585fe9b688d5314e3/losovep.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gqnstdlprfudm9vp2i3bbh51f4/34659644281.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/klgevioaa244uev9i3s7h3qo90/95462904903.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e870517cfbd---fubowulev.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d23b1fcd312fcc21ab38d0b58768507f/17258151079.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/3752752839.pdfIn PDF document text
    • http://beiks.info/public/file/29674224690.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f9eb90a46fcd2094e35911d90a6a52eb/dumafonikudekamuwa.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/97155601532.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160866f7ba8efa---fumejisokesuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+long+does+it+take+to+charge+a+power+packPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 17500 bytes
SHA-256: c8d668dbba59a506041d325236fe7c16fd411dd70f79a322e942f438c1a50883
font_01_sfnt_off00012232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12232 10960 bytes
SHA-256: c9d5a38be0597cdccae7cd3b4a7ca9418fee07089f64076f687735eb0ef24bf8
font_02_sfnt_off00013b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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