Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4c40be99e2b116…

MALICIOUS

PDF

83.4 KB Created: 2021-08-22 23:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0f36cdb6b61376138bd496fef720186 SHA-1: 954b1fcb16e02d092f9d4c64810c444ef24a103b SHA-256: 8c4c40be99e2b11658d71c956d35e2382af89f6583422041dee77650f8a8aa0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 hosted on compromised CMS uploads and disposable hosting, with numerous embedded URLs. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90ae23b7b---belaxiguzajamanovasifada.pdf In PDF document text
    • https://sanruouvang.net/images/uploaded/file/tajisuli.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/6650641964.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/zidaxerobejigewimufikup.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/83167460889.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddc3e64978---44478330452.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/32961580377.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/66287568061.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/49463078020.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/demupafib.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607603337424c.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/8159789361.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/2eb6f1181daf57757c18479805826323/55183070309.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/l9ce01vqfq3qe5o21gl6rtqao0/71095882679.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/kisusoposepu.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/583a5f1d1cb938774bd8c185338dd3a5/52936361501.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jigiponeped.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/s465rnlqc8m2c0j6c5ef14eqf7/68892826346.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/nesomogurefibojidorojanu.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/64085210708.pdfIn PDF document text
    • https://andhimazhai.com/images/files/73190468412.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ldn1ej8203lm71vopkg5iqt045/21957661649.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/baa55f41aa360ad47e16360541c2a961/jogomomupagusobof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=non+stop+full+movie+youtubePDF 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_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 18588 bytes
SHA-256: 7f193ed4f71427a9970748956ffea1477c564bceabc88a0ccaab6db12b808363
font_01_sfnt_off00010fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F2 10652 bytes
SHA-256: eff315eea03dc893ba747f0ec499508e01136a6254f46a73b6206c4c6b1f7662

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