Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf56449772ef0ea…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 10:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 20b63ef44a14e8500f491dfb5aa07dfc SHA-1: 74ccf294d0313454283b89cd04a9abc6ed96b261 SHA-256: caf56449772ef0ea8ddf9bf53a527fa3d2f3385e97dac1554eef5b1f8d608a22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=class+d+airspace+rules PDF link annotation
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe9fbe68ec---54593934854.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b380fa8f869---38804033565.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77dd240f0f---73169489877.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3ca5a67a1---88749738564.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2817f9a4ce43ec451cf185e2673937ee/94854039148.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeefaa7ad6---pexaxoniz.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/foluwifesevulutedibeluf.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745dbbbf77a---tamokunopidotusosibotatil.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8587ded5d2dcf15f0dfc2ef67cb272a/selitukapep.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mbvjosqd93j0ig5ubomju0dnv6/20020404403.pdfIn PDF document text
    • https://zzhqhi.com/d/files/67423487096.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/305g0pu3sb33sjqfnqj05ta7o9/33393910320.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/76154836048.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/25d19234bf678d854b2e2f8361a984c8/7174828646.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b054d2ca10f---68495824780.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210627_5E4C257ADEE5B533.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/33577216030.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af3894b3b1---volametemazepupese.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/orqdaqbi3vpep4v00pd8itakv3/liwibefepozu.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/fudosavebetavako.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/3d59145e613a4fcd93e69288de3644bd/seribimopijulurudal.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f93890bfb8---36304611946.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_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 10316 bytes
SHA-256: 2b91dfe3e6064524fbd9f991181977d886375456434726e735b89672d133f2aa
font_01_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 16824 bytes
SHA-256: 9c623b2fe19884058e795cadca129e23dc6529c1e071131c4901d0a3b7c2f060
font_02_sfnt_off00012fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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