Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec42a0fb1a15b1a…

MALICIOUS

PDF

94.1 KB Created: 2021-07-09 05:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42b1c5052d7e907c59987fbb2f81bfb1 SHA-1: 67d3139672bafc48057c79bf78b77bc8d1935fac SHA-256: 5ec42a0fb1a15b1a3719ac862942f3c9ae289accc5c6216caaa9318e471611bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://wastran.ru/uplcv?utm_term=jobs+that+are+outdoors+and+pay+well
    • http://anhuizhkj.com/upload_fck/file/2021-5-5/20210505153126148197.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609571bcb9880---39903964307.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fdb35768e---53515844221.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b838733e3be---saxujafolifuzegor.pdf
    • https://veaodaibrahma.com/uploads/image/files/65871587938.pdf
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/dawobosati.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b4c32e0cb287d53b01d7c56021bd89e7/74154495530.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3dd04fb5371035f3cef913eaca9ba46f/99531718208.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/6f7d5c8df85bb06e1ca46de45ab1b425/90054485861.pdf
    • http://www.asap-recruitment.net/upload/file/sexiputu.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24a47dcac6---nedekosevowenidavilavabiv.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/8e75197be19043eaf8c8e1cd9f74442d/modoferomodajazibi.pdf
    • http://spalovnachemolak.sk/userfiles/file/50295602487.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/4uv0gmn1p997s9opunu2b3ift2/jejonifuxaluxogojavuxaga.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/492bcbbcae4f3a7db408a81f4ed0617b/34166464538.pdf
    • https://oncetrabzon.com/resimler/files/93367280219.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/db52216c0ae15d43c24355a1fedc745b/wipajotat.pdf
    • https://people11people.gr/uploads/File/85929649960.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca73053b74---vaverekixasujezokusadaz.pdf
    • http://kurdumovldpr.ru/uploads/files/zonajerosab.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/c4vh77mq0guoff961gc3df3vrk/pisiguwedifadikafo.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16085270621bae---55923993074.pdf
    • http://www.serenissimaservizi.com//files/tebuvakatuzuvosiv.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/n1g0r9lpki7abduhcg358425b7/54535971811.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dc1.bin
94873e3e26cdae24f4d2848b3e879d60f6ac8ebf53cc4f606a82919141138308
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 17024 bytes
font_01_sfnt_off00013a34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A34 16792 bytes
font_02_sfnt_off0001524b.bin
08dfd907cbf66dc3a174dab0d316cc6d243abbe35023253f9ff1e287123c9637
pdf-font-stream PDF embedded font (sfnt) at offset 0x1524B 10828 bytes