Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e556f1cb13ee309…

MALICIOUS

PDF

87.9 KB Created: 2021-07-30 04:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2f4f2babad44d4e67fc0076a939e033 SHA-1: 16df921b18f1ae32814123e57e15c9f1c4ea31b2 SHA-256: 8e556f1cb13ee309be353b3904434855a3867927d0e449746e4bcce1a33918e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crewmak.ru/uplcv?utm_term=breusch+pagan+test+stata+f+statistic PDF link annotation
    • http://border-inn.com/CKEdit/upload/files/mupun.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/lezunuwulupidegalo.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/94396700971.pdfIn PDF document text
    • https://menu2uplus.com/images/file/fotowemovo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee8db067b3---gozojajudulurani.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/koxikatumabarokowal.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe26e2270e---88283402125.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/judozokefapoz.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/weleli.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0121cb6931---63460397976.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/97424387608.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/14c677693fe7f54abfab05cfd4bd7189/95204340693.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/lunipibi.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210531_B39134D596B688FB.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/52bcbe6547b4e10e304226d96233fac7/lekolozek.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/96055630089.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/66906868716.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210626115516_867300620.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/bimaxuxobojewepeborodifi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/36357270936.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/v9k8g5phhha49i2qjriofopp51/segavirepanaso.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/15760208218.pdfIn PDF document text
    • http://jkohut.pl/file/87699487093.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/34a55700e293b79a777107abf7691389/12468164371.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_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 10748 bytes
SHA-256: d12685536f2402a798cd746a62913c92b4fd64b7540e8b061021374618b7e2e7
font_01_sfnt_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 17912 bytes
SHA-256: 8c68758dffcd087255abbb04933f04a26918741493fbfe4bd52ff58d7012b0e0
font_02_sfnt_off00013899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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