Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f1156bebe3bc88…

MALICIOUS

PDF

80.7 KB Created: 2021-06-28 19:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 52cc46918291ac67af8c333f9b59274d SHA-1: 248c5cf815484362682865cd71f68484bc01e7ab SHA-256: 16f1156bebe3bc889432d07a102949b12cd1020d69e7b56e722eb0695f526e8d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The document body is unreadable, but the heuristics strongly suggest a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://vntdc.com/upload/fck/file/sibuduvedugizovonugoz.pdf In PDF document text
    • http://ahlhy.com/uploads/file/051859197962.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c29eaf7ea---80428090940.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ljpffq47c5e47j0aj7b5ovll2q/betomugi.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/mupapufivuxen.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/k18ifu53ugs49nsvsmm8ctd5u8/56963679813.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094776eb8aa8---joguwexurofufadogikokona.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/lamaduvabopavabag.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/ketoxexijezi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6af3070aa---xefunikafijixusonefuk.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/nokuzol.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pebodiwejojukegoforilu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d288e5c486c2f8d09eacaf73a46bd49a/6158471334.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/lolowaguledamineki.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/54658538411.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/13352520254.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/0cafd6408b598f8f5a07d4bbf216e354/60286861739.pdfIn PDF document text
    • https://esz.jp/img/editor/files/36266541381.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa50a9789e8---piferugivafuxuxora.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc7c0d4b27---51244642653.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/0dss68t6kp5p0vad1vfql1qlqi/dabajikajogezege.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ahtskvjgb2i1mvnu3jum9tjk90/20703198425.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde7a5c2a4---wolibodosefigefanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=collinear+lines+meaningPDF 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_off0000d1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 20296 bytes
SHA-256: ebcc2e02bfc6536f473ec8065619c962349e8c0ab13e0ad10c52cf966d541cbd
font_02_sfnt_off00011e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 10384 bytes
SHA-256: edf3558f3d0ea07e88a87193c453cb2a9c34d2f05f6ced03c145507338e00a3c

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