Malicious PDF — malware analysis report

Static analysis result for SHA-256 076530b599e6b932…

MALICIOUS

PDF

90.1 KB Created: 2021-09-05 11:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ee737a3f6f9c3ece57f59847c78ef77e SHA-1: 29b5f4fa9d1f99d719d756ac3f84181f8636dcba SHA-256: 076530b599e6b932c33337d9e6e6384dddfe9344c3a75688318f09d656252570
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. The presence of multiple external URIs and a link farm heuristic points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://willbramephotography.com/senuvirajinefipumefofen.pdf In PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/leguvigejefusejumopeseno.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/76833698467.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/19599750284.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/33690601840.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbdvio6pv7t8ftb84eubmle9s5/duwutoter.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/58897965667.pdfIn PDF document text
    • https://blogsma.com/files/16947150958.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/vominenajolipotefojoda.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210725041808.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6ecec63137f505f021f3300b9c0af184/57136409475.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/bibiwemajuzotegod.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f70e588a0b---guvukerukixurikivoz.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/puwopuzuv.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112dad8638ed---16837625043.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/qgacgvv0g0aj6frrcf2hkp5gs7/sunapizikukegigubivonebed.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fe8d5dd5f---taxogefuxitixibun.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/2ade0f588c589b8280f596ff96249c6e/47921910333.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16123cc3ea97d7---1553259706.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/q2dmnvs20hppvbj02nvpkel00j/55011703492.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/vekiwezemuzomewubuti.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/nazogelanosofaka.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/20/besewipokamadaf.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/89923935720.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/17283227756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=orbit+model+24713+manualPDF 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_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 17292 bytes
SHA-256: a384d13a4ff51f34943b907dd4898549f7dc80ef7ebda3ecf795edc89a012dc8
font_01_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 10980 bytes
SHA-256: c43b7c561cbd5e071c6ec5a4e676f5da31dad7cce6e567b442ce0e4d4df551a9
font_02_sfnt_off00014247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1