Malicious PDF — malware analysis report

Static analysis result for SHA-256 113ca568f8466bc7…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 10:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85beb7cafaf9d68f1f45f915f2f7507d SHA-1: 794eb6c495d1755095f0fc70b009c63d5dc2005a SHA-256: 113ca568f8466bc73b8164b49cfe1feb8f4ab63930618b8cdde37ec07562c670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700e33b3d5c---19063276783.pdf In PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bddf116b3db---xuxosuxeserudaxilidimusuf.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/wolixuxopevoxunogisesis.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5153e2042cc8d1bdfdf4ced9a1f42073/kuwuwibatu.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210721_5FEB529952091813.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106ff5f563f3---fupoloxapoxolijox.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/kivurevulerafujabaminif.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/4549a110936fca4b83b2d37b1db4c144/33024647951.pdfIn PDF document text
    • https://rcot.org/userfiles/file/zelax.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725b2f99b8d---71609972770.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/19931752207.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/35454998991.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/45170345513.pdfIn PDF document text
    • http://beiks.info/public/file/72476603125.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/11895024238.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/lasoxoxonib.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/17920323050.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/73000431783.pdfIn PDF document text
    • http://etrustmi.com/ckfinder/userfiles/files/83928090735.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/13152803339.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/8t92iiu8djopilhprp2jc370d6/nirodulolopojezomogem.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/giwosajariwur.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e56f31c030a9701c39b1edec23a7240b/mizakupusefefujisaboxil.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/61900738709.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160beb974c665c---27287005449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=grimm+brothers+fairy+tales+snow+whitePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 10860 bytes
SHA-256: 576fcbc1275c3703b0628625b68916ae1857ea08f51164d963bcf559d6849791
font_02_sfnt_off00010f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 18272 bytes
SHA-256: bc3f4319b056243f7ba006682b0f56166dec25e7bbc9d79dc0fe121164859374

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