Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4513e699835a95…

MALICIOUS

PDF

87.6 KB Created: 2021-07-01 00:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8725149dd892dbceb4733df95977ad20 SHA-1: f6914fc4b7ee5fe725464868fe56c1ad8200121b SHA-256: 1a4513e699835a95b800782cbee37bb13254e4d067df1beabefdefa127ba65dc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=catahoula+puppies+for+sale PDF link annotation
    • http://aucoindeshalles.fr/menu/file/29340333875.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/32449692443.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/49450985551.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/kibokedemivukavugi.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/baf755833fad2b2b8f76b0156ea57f52/zojefedixemiz.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/52855734631.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ea7snlu79ncfofb6jo1mqtsh54/fosilim.pdfIn PDF document text
    • http://praguetransfer.com/files/file/12338895067.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wovixevujodebotodisa.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d103f38a---jemamaduvuf.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160702a3b825bb---76439181964.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac2e121ab5---17942940398.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/a12aa90537fe5609b11f95e7cf84366f/fovisugovafiwamofoxijomis.pdfIn PDF document text
    • http://midel.me/userfiles/file/rojavivuk.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/pepemi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6accd4e3b684ec1adab7b4db4de7bfc5/98480368481.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/2044c127ea3d4c24a3de44d6d0c70508/metavunemori.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/fotoxax.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc76bc96b---famukexawazakekinupudel.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3vg0hnq96edlj1f7t7fk8g4vpa/libof.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/tiropebexafovanemajubu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1303aa02d1---tasudajodagejafowebawi.pdfIn PDF document text
    • https://invest.pl/userfiles/file/zoteguwil.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b1c887f8---22449656032.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210503041724605475060.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_off0000f422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF422 17292 bytes
SHA-256: 78dbd785c474b10d4c5ee501f42eef5e99c7cc7ffaa0e16b29c7cdaee0da941c
font_01_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13971 10480 bytes
SHA-256: 2d9e94a977faec6196aaebedf22f1ba9b6fc680d2182c44bf95ac0aa2c1d1f17

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