Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ff7f5abdbef513…

MALICIOUS

PDF

73.4 KB Created: 2021-09-03 19:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cbd6640bc03d3a046b01c4ee44e9cb86 SHA-1: b59e6388619827e656cda9ac3c0355fa59d27e14 SHA-256: 58ff7f5abdbef51325f5aedd28a9e6f1406d5407465c43b4c2b937baaf30e438
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites, likely to distribute phishing content or further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures and potential drive-by download attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://irlanc.ru/uplcv?utm_term=dbs+puncher+manual PDF link annotation
    • https://alakharia.com/public_html/userfiles/file/2261149499.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/wepezopal.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770d51ea287---jowilalenoj.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/77813477896.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607212b2703ac---kabadireji.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8512b9e95---89299783802.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b024f81c7ea741c667e11e620d063c4c/39563043601.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/rikelowekegegiwaxevo.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ab9967d3434e1863545c192ac8700da4/nesuvatorodononi.pdfIn PDF document text
    • https://wsbtitan.com/images/file/zabuzenaluludokapepiki.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/69347971961.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/moguwijowowenuro.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8bd97375d7d51fbbaabd56cc01d107ce/23407669334.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/35532207456.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b2cb9e7917a1c496630f80312d1dad55/buxezitalamojurukudo.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/mudowasoluki.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16072efc756946---36268564338.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2j224bbtbh6uborpumg9ufvdt5/20647038343.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/bea7d6a93125e224703801f4c9f47e42/26186807840.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609e346931093---97133242525.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/b45d3a18994d5f2d74ab36a5785554e2/jukagaziselevufiwawom.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/4f735a03908f60c199ed5770e57caa0f/vobozogitafipigasowaw.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/tobitovokuwi.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_off0000bcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 10568 bytes
SHA-256: 1acb491d7673b185a7cfbd532c44cb06e15c0af9da9c176f346a4dcab6d7518b
font_02_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 16984 bytes
SHA-256: 78aa852c3575e7ce1ace7c7bb39cfa42202352501af541af34f22049e92f6c3c

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