Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c81242a6264f660…

MALICIOUS

PDF

101.0 KB Created: 2021-09-03 20:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a579be07d5532f0081d6b754b07ef34 SHA-1: 764127fb5745a76068082edde35d73b98d359883 SHA-256: 9c81242a6264f660d0f1cd3c1a97d9156519b055baeb092453377aa2b3a89039
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware downloads. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=trace+decay+theory+pdf PDF link annotation
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876cea05d4d---15032766517.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/nezexiworidedagifok.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078237b7793b---72396086591.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7117c5ff1cf818b496eadfac98cd137e/81874482780.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5761bbaf86445d29411da596852b8954/21867946935.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/48052676383.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210526_27AEFEF2240054F0.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/digotavezabixopuko.pdfIn PDF document text
    • https://funke.be/data/file/danajigonisitetine.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/joxubobinevituduta.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/jotapalogenupajexobubesol.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/f07pc3849jbd0arb33pmbtrpoi/6137652839.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/4rm2r5a5gsmtpf4vbrmt0ege60/najemin.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/93515075820.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/43146054851.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cc48dbc06---romijogusemapixupix.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/17358241644.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e368c5d304---govoxakaxox.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f419032c9d---45776251070.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/41027011044.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdb35e1e1---junakonekapisobum.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/8628008877.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_off0001259d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAF 18880 bytes
SHA-256: e473a71c77705939f1074b85d15c5187c42c6a8649675d53e3209ac438436b01
font_02_sfnt_off00016ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED4 10384 bytes
SHA-256: 3911eccefb3951a610125e0952283c2fd1498c7e16759f14bfeecd458425447a

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