Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4175e80c892564…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 00:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8b2ce631cf67da34d77eb8390d3f0aae SHA-1: 6b2d99bf2b1043ee893046898f6c51f490365ffc SHA-256: 7e4175e80c89256410717d5bbff9825e33cee4c8c860615e1f7e92e39b907d5a
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests the document employs social engineering tactics, instructing the user to execute commands, likely to download and run a secondary payload. The numerous embedded URLs pointing to compromised CMS upload directories further support this, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6967330c4c---giloriwirepi.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9bcda466de13dbcff75dd907af74bc92/36012587609.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac184045f32---47054801304.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082600b47e39---30199156846.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/gatagimo.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/67075838277.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/33148617180.pdfIn PDF document text
    • https://moolans.com/uploads/files/72324602294.pdfIn PDF document text
    • http://jarosi.hu/files/file/89577102658.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9024d2395---12066559020.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad017086dbc---32582038184.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/5490038827.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/16625474125.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/69477469761.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/govugezewenemetijagotamug.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d54bd7f6---42468779576.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/96804781600.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/8b1fbbe946bfa193f9c0274147c42e3d/miwororobuvew.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/31682518463.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cc2c834f866feef2bf2252ebaaeb7f29/24334990103.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ee22da88ae44c81c9ea5c7f7deba3781/55311311604.pdfIn PDF document text
    • http://zae.me/datafiles/file/10172418936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=correction+in+pdf+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_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 10316 bytes
SHA-256: 41bd52ceabe52e272a618568f5ca58e02f79f1a7325d9757e086c0dc4a6b8ab0
font_01_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001222a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 16596 bytes
SHA-256: 202a1f2c3e90fe4078cfeaaf19b7fde1d4d1f742b41134caf0ca933a749200cc

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