Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9172db11c2fb61…

MALICIOUS

PDF

109.1 KB Created: 2021-07-17 09:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e575757d76e784f1c9649baf9d6daf1 SHA-1: 7fb74aa9c84cf91a1fae678e361153fc76c987e8 SHA-256: ff9172db11c2fb6174a76017590a5d357afec1ec69557545f6a3d52f2b0c4c74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lexcyberia.com/userfiles/files/kibatipisilirapewek.pdf In PDF document text
    • http://ggmtc.net/userfiles/files/rapinimizemafanodesuru.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/rosexawosujizif.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3847eb64---33216629022.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072627fd4cc7---57690797740.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5dbdd0d4f---kagovijinizexaxikulure.pdfIn PDF document text
    • https://computerzone.pk/file/fewuvetamoko.pdfIn PDF document text
    • http://accronline.com/userfiles/file/14541789449.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/86b7c1440f551f26c245ee0a5bc0dc57/52461674156.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b121f0559d---19257900293.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/dajogupamumomizixaj.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/rivoxezenivofenad.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083827431516---nadegikowiferizevekuke.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abef14e08f0---demapapefexa.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200254259102.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/38359421839.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/sizoje.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c018e573e---55426751423.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160802f0ee9714---lupopod.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e81c4346e66---jowegedudebukolovopale.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/eb5611c9eaf3d54e5abaeaa530a13332/42076354814.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/689e96356cb61a023efbab45ed2f3859/94410607589.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/moxunegogazilafutefuriw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=old+town+theme+parkPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 18140 bytes
SHA-256: c1a025ee7f42100e62e5a41aa99fecc7f7ddf573dd947d5a7f32f79731141a16
font_01_sfnt_off00015bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFF 17648 bytes
SHA-256: deefb2502cd2bc7ee57d433a65c5b3e8251993b3446cba4c89cf2407490c3675
font_02_sfnt_off000176a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EB7 10600 bytes
SHA-256: e3df7e1909f9ee7d06b2b130bfe9df37837b9a721ec45219513eb32dc1980863

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