Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5f5733f7c4bc4d…

MALICIOUS

PDF

86.8 KB Created: 2021-08-24 20:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a43e332f979d2737a71ffdf3da8f997d SHA-1: d8501f95530d4f6f496a8c9165f08088d8be3d9f SHA-256: fc5f5733f7c4bc4de6fb2a3a87c012d16f85654448400ed9de631d0f9f9a6449
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on compromised and disposable hosting. The embedded URLs, such as http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608324f5328c6---noramolexu.pdf, are likely used to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=tissues+quiz+anatomy+physiology+pictures PDF link annotation
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608324f5328c6---noramolexu.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/01bb76c9afe2e537db1bf7ad47533f67/nibeguxokaditinixabufuju.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/79346184489.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bcb0eabd6---watetegidako.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/44440517620.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/31691631862.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/71707213820.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/u418l623t5lo32184uof6svln0/50401561232.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6340e5cc---rerez.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/40679962821.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/3d498275148cb18099bb7b006aead94b/sadawi.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/jodibibexesoxapipubu.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/75152534826.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/4088207788.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/67721112816.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///bonebax.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/96286550552.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/vogitisat.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ggksbdfn21ma9sbk1r55b1la9u/39359064766.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cf1c5ff0d9249203f4ae7946f3919a11/bumudajonaboveparuzuzovuf.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/31j33stlgm9opia8lrubv4jn93/wojizigavovujegito.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/68755999654.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/jelesafeser.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/gidofaja.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_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 11204 bytes
SHA-256: 8862db5fe9247b299012844aaf665ea2151db02e3f0212912698932c59ea905e
font_01_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 18360 bytes
SHA-256: 4216bb304f9b1445ef3791f29312935b55a6289f6e2b77ec2c25546fef6f7997
font_02_sfnt_off0001353a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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