Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5567d0fcc125eb…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 17:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efd51a0594e7c6d53df8844a4145512e SHA-1: 5c42abc332ca5b6e4323c425817adb492b54c942 SHA-256: 5f5567d0fcc125ebf513dd6113b805d1b5a69fec139f7e1b9096186d20e138d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tpijobportal.com/ckeditor/ckfinder/userfiles/files/tavobevesu.pdf In PDF document text
    • https://aynadakikemalizm.com/resimler/files/39145261596.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/6e551ec602623c025dd7474d646eb526/52991573236.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbe52d1a0c---dezimibirumegenelorevexo.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-09/064c0fd39846bd9a21075101ceec9f24.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/99825114937.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3237276423b3fd08a11722a79634a148/14655310808.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/xasobodonomalorub.pdfIn PDF document text
    • http://bubb.cn/up_file/file/8356783559.pdfIn PDF document text
    • https://dhesient.com/media/gamupuzafoluvazefopiva.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/41632525717.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/xetuxuvetomaderoxerowifu.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/26887245363.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/lojaw.pdfIn PDF document text
    • http://iphysiology.ru/upload/jotizovolasikuxulix.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9577d4cba1186a03572ddfd6dc5b4920/letolevawefogogofupapoli.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/78137048456.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/8622272722.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/kovuserotug.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/45820573821.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/108154764.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/netipawajivexebusut.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320b546c865---pawotajunifirorasabosam.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383e371da2b---84686196081.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98dd7d490---tosovizurexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=grey%27s+anatomy+free+watch+onlinePDF 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_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 10872 bytes
SHA-256: d908ace689f47142578cb787118d5df47886ad12cfbc7ca4e963ca320a81d020
font_02_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 17056 bytes
SHA-256: 9f454925cad8998891a5b93f76d8dcecdb8223123673d7da7a8ab52b2be1ffee