Malicious PDF — malware analysis report

Static analysis result for SHA-256 080a4d521c733610…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 20:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5e2c6410cef25827b9f9506eb1d61c4 SHA-1: edc27035c635ab573ab32c5463a4410333c8c164 SHA-256: 080a4d521c73361092d747d06179af7bff50cdea4cf7b85ddcdaf46c5c2dd400
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware download sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=grinding+machine+pdf+file PDF link annotation
    • https://cometsecurity.in/admin/userfiles/file/dodos.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/livapalonox.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701e7f57238---62489304922.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216664596151.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf01e5bc0---metufuxumavube.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/ganubalorep.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/sexobodapizaboketo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2vlh4i83iig7947mg4vpk84po4/xiwidepejutazumu.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/86304664777.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/b6dkj7hv3hk395bpqtn8nko3i5/ruvalorixesalaxavituv.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/govisamawa.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc3b7eb58---wijonimabaloresajiniboku.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/xotene.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/39722543857.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/995415174.pdfIn PDF document text
    • https://vestol.bg/files/file/35402783211.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/16626383322.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/23660773437.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161104ff9389cc---67860930416.pdfIn PDF document text
    • https://okazionche.com/files/bupawadewem.pdfIn PDF document text
    • http://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/nukuturamozoz.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108f90623f1c---71105809158.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/93t55tbceid44vmfv5ms6ob0q6/23656660274.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_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 17168 bytes
SHA-256: 7a91758b8b1f07bd1e4c8ce1feab05d27f44eec0c862bde7de18dacfde15dadb
font_01_sfnt_off0001166a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E81 10720 bytes
SHA-256: 3917c24644ed93d07dd4b282f875c5eeea4d31330249ba19abec1bf1071b44e0

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