Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afbb5a796a7bf6d…

MALICIOUS

PDF

78.4 KB Created: 2021-07-04 02:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4b3daa25a7bb3ef98b20f7f94a907e07 SHA-1: 6b5eabe5f38c0bf8f038da388077d2fc56fdbd32 SHA-256: 6afbb5a796a7bf6d830d93a2ac34c5d08053232227951a7ef0f0f5b60bfa7bc5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm, with many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack vector appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=form+of+bring PDF link annotation
    • http://huile-de-nigelle.info/userfiles/file/96559212869.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a350c5d9c9c---dazowizesigolekuso.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021060117493319.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/17491275474.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b866bc1b8ad---rusavabig.pdfIn PDF document text
    • http://blueyee.com/upload/file/020810121614.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160832670b41a6---xizasijizuvalo.pdfIn PDF document text
    • https://tavio.ru/files/file/31745496352.pdfIn PDF document text
    • http://tcihk.com/userfiles/82135815927.pdfIn PDF document text
    • http://aimic.com/userfiles/file/2092143749.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/atcsfp6rtja88ma93t5f8ic9o3/lijukirofovev.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160858f7ed5376---56031835311.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/4333931468.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de14f80c87e---19155639967.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/d01cc9d4805d1a83417e51a024ca8b3d/83651784603.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/603aefba62885b98be333f86ac08ff70/siwezobu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a1ceeb18d8f578ff04fef72fccd3b1e9/13923801409.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/27935003246.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/26622893765.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac31f69ff04---33257512069.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ba73f68d---13352685397.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/timakovokivenomokonaxu.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/88780b03c3ab7d9e8c9aa52451972877/masufudidujilineboj.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg4pmq0bjfld3u07ro5ffggla6/161620726.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084a238225ec---48877233047.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_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 10068 bytes
SHA-256: fad3d41882af6aaf0fd64329017397621357411cce2fca2dfe8ae34ac3d5d935
font_01_sfnt_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 16220 bytes
SHA-256: bca025a249a1cbd61d5a3353a56503bac53b53782bbdeed1a360ead917d326a1

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