Malicious PDF — malware analysis report

Static analysis result for SHA-256 8142558f29049578…

MALICIOUS

PDF

87.5 KB Created: 2021-07-17 23:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81756abe7e0de8900cf00b0a4384d03f SHA-1: 5a429400edd8c6866d76e23b053ccf24a9ab9654 SHA-256: 8142558f2904957834a5823431010237eefa1dcae240d80ec90689867381e33b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs hosted on potentially compromised sites reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/n74cbbcf0ackmso5cuqgh9thrn/47685003448.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab4310a92---64111998324.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/pofupavuronaweromojaza.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/45252243937.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/51748671596.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/db1e7e0344499f4db61693b17ce92656/sonabolevodavuk.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/50abfe74f766fbd621aaaa05b23a3254/vogalawotigofimekitogex.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/56612364904.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/45290018111.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/selamo.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/475ca646a7fedc274b6a9fb2bfc0ab30/wosegorupenozibuz.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b0c6deec749a7fb3daf124adc6d99d16/22874678984.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5a534fbbf---gabolopopalu.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/dibofosozepo.pdfIn PDF document text
    • http://dgjst.com/upfile/file/2540645039.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4930f75846e9b7bcc64e3b53a3e84c32/bogujofizegiboze.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/xudifikedisapafarefi.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/xoxolulameravaki.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/ruwis.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/61339238325.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7885dcd7d9ae1c3fb059dccab17f7638/sitewifulelogibamet.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a66509b65---bozinegorogugibajiworawo.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/12359967033.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa0462bb96---kuvadasorutisig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=conditionals+in+english+0+1+2+3PDF 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_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 16692 bytes
SHA-256: b8b717fedeaac03a8c7b7f60ae6d8715c76dc7c876b053829194d4be17b3acd9
font_01_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 10924 bytes
SHA-256: bb9f9201053df1a87338f1f7b526179bec3bf14efe3e4dfe9a9bce362f9abae3
font_02_sfnt_off000138b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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