Malicious PDF — malware analysis report

Static analysis result for SHA-256 c141b631d5aab763…

MALICIOUS

PDF

76.3 KB Created: 2021-09-07 05:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6eb389793097e1dbdba72b812c111478 SHA-1: 1bfc6bb1ee0c1901b1c965d22b24dca7feef2601 SHA-256: c141b631d5aab763835590ba4c139d244427c7d3e29b64c0639003dca9daf523
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 storage, suggesting it's designed to lure users to malicious or phishing content. The presence of multiple distinct hosts and the use of 'utm_term' parameters further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cddf0002---87858833837.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebcc96c9e9---81931070148.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/73006696729.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc73dc645b---40974181762.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5100088923608f7ee68c4fb374915a19/95934581406.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/novazip.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/57423590369.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6b333fa0998b8b259130f8b1580d653c/furuverogasedapajuv.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/70145160536.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cp7f0aub4k6f7a0pds05e743g0/3902999429.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/65273930083.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/tuvudev.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/juvugatizupuporepujowaz.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caeb00757d8---kodudusiti.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/gixewop.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/dezili.pdfIn PDF document text
    • https://webmenuplus.com/images/file/79032686133.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/db550ae77bd8748033664af587ef13f2/pazetepuzanedoxokitodatow.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16088c1fda8019---sekulekegazakarojojedi.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/61025438274.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/7938492b47d789a753a9356f839d5a8b/rijijedaxubekatoketipem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lean+production+system+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/87798553745.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB624 20632 bytes
SHA-256: 1edffb5e23054154490c3192e4d5cebefba63926bb190b7bfe02592f95aa6425
font_01_sfnt_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 10908 bytes
SHA-256: f3811c52719464ac1fcf8dd4bbc6ea6383134bc56807a2ec99c56593f0be17de
font_02_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00010b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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