Malicious PDF — malware analysis report

Static analysis result for SHA-256 76da23fb5c8cb429…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 09:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02e4ead186499f6966f71bb0a99781eb SHA-1: 690e773e923032e5ef71f159196670eb8beb21b9 SHA-256: 76da23fb5c8cb429a1aff1280996f81dbe145c1eb970db9b566f04c088c27a4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to create a network of redirecting links. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=komatsu+joy+global+pdf PDF link annotation
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/tesegopavebopil.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/a77379c9d8de3bd11245e5650f55a444/82735562892.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/kibuvepe.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/96437327660.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/rekurarijez.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/34655989315.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/46905212865.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe63b0af7f---50446621912.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/nexizuwirerujute.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b8262d970---82614088253.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54fd64efc6---xurunagegazoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a713664cd---89733113562.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/752e4862c9ed7324ec3bbe904b7bfd8e/kulujegofiwavokumumobin.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/zifomologado.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/qhufh2333ts5tvl5shdlvhp78j/57863389527.pdfIn PDF document text
    • https://kaisar168.com/contents//files/17985583537.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/aff72716c121ae0ad6ba0b75e1894160/37505365943.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c69ced0550c---24464425839.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/zedadopomirujuxibo.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/55289564185.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/81336315524.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/muzaba.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_off0000d058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 10888 bytes
SHA-256: 483c39bb7cf4388eb8803751be85d2a9488838b79f4e7890cfea9c1a18921321
font_02_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 20716 bytes
SHA-256: 80ba5843d6008b5c7e49a4ab6b20ac97081bd491909fbbe86491576f9a82457c

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