Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28dae13ced7be1c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 21:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 951550f351bd759eb790cc0a4bc0a10c SHA-1: 1b9973621f1a5e6dfc97c91887ef89c635a6cf7b SHA-256: d28dae13ced7be1c335316045acb40acdc7935357abf858606d22d29c63ef599
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://philabc.ru/uplcv?utm_term=creating+fillable+pdf+mac PDF link annotation
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2628d20a02f6992c1915baa360ab48cb/fevipaden.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/tomolevurov.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/3629196980.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/87990194419.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/291403779.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e8e06f125a9b6eb4071d10fc78857c38/jiwupukaxa.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/lanezin.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7cdce9d1---90295641619.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/gixixotugubumovog.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/nuritozuko.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fd1a0241cfbad9690e82d5c747bac606/xerejam.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/jadewunutorod.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/jufajelakesejaxibibiba.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/j0p2bmfn7cfctkulecsr79cqer/99199201820.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/190kilc47bo6ieussec8n0q9k3/86939746926.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/kojepapivusifese.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/lulimerurowaxigurelar.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/tokabasanakokuwopilizabev.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/57429720690.pdfIn PDF document text
    • http://sun-tes.ru/files/file/67377208704.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/ririgixepa.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/tegajaritotefonepaf.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56aec2f5a---53936314613.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_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 17756 bytes
SHA-256: 883a652115164c6d34f16726918f75cef735eeb3c8ecf633d98b0d74c0c50bfd
font_01_sfnt_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001294a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294A 10844 bytes
SHA-256: 6bda072eaa713f0d0ee2d406b921bb67e688f0462f15477d849a96d812008fc2

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