Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6f34add20973d6…

MALICIOUS

PDF

84.0 KB Created: 2021-08-30 09:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8c17bae95e2dd726d7d91e3433db767 SHA-1: ef0c11f827de096c41af533de9b287cd4a862da1 SHA-256: bf6f34add20973d6434397637e8a443cab0fd2fe767e40840bae1f322e3671de
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or redirection mechanism. The PDF's structure and numerous external links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://chronocertif.com/userfiles/file/waxurajowufe.pdf
    • http://refpecsbelvaros.hu/kepek/files/zufof.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/14056628802.pdf
    • http://gyobel.it/public/file/sepelolamukum.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb7ffdde0a---rojizufugilaxodutonidave.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103a8f81d59f---natusixuwasabotumomekepe.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47c93888e---32382300653.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbfd90a76b---vonufubosizolukeperoro.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c07688269---ropawo.pdf
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/34608013075.pdf
    • http://31kouqiang.com/userfiles/file/1624928572.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/29406366777.pdf
    • https://vibanghanoi.com/uploads/files/depuzapofo.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805cb327c4e---93309187948.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f80adf9c7c4---16699078729.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aa8285422---71807079089.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d22d1d301bb---47675036689.pdf
    • http://wxbeimei.cn/upload/ckimg/files/202108190625572705.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a625f0164ca---wipiruxevoxowavexomu.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/44a11b925c3758b3cdeb0e509108c4aa/silomuluxugok.pdf
    • http://tzsunup.com/upload/35676007863.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2925dab9b---75634574116.pdf
    • https://inijariku.com/ckfinder/userfiles/files/90656330373.pdf
    • http://angeladaniel.eu/uploads/files/58243690924.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=overall+tax+burden+by+state+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e11b.bin
0ac5d6227c2577966470e9e2a02126be53c47f6c2c68ba9322aac6c6fbf3d912
pdf-font-stream PDF embedded font (sfnt) at offset 0xE11B 10820 bytes
font_01_sfnt_off0000fa58.bin
b06caae7b5f892475f2e9e5ee9b7a184a1dd57a8510c60c0dae6e72acc7a3d63
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 18172 bytes
font_02_sfnt_off0001295a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1295A 16792 bytes