Malicious PDF — malware analysis report

Static analysis result for SHA-256 571e8c2479d6257a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 03:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 688bd0d7972ea42437983ced9a41cbb1 SHA-1: 9af899c6c645b4b6e970595f9a9a9bfb1e206044 SHA-256: 571e8c2479d6257a6a0afafac87f0a5d07dbe0d45b3c48b48332b972f2274f0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://durgabas.coop.np/ckfinder/userfiles/files/pukemuzotomilor.pdf In PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/950afaa02d45387a960063138d3a10e0/worigumi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bemexagejalesofuxututono.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abd5a6921e3---34588652512.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/tedewexezekiwunug.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/79694514908.pdfIn PDF document text
    • http://impactmediaresources.com/userfiles/file/13765553876.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/vunuvuzavowenibim.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/96925760415.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/abfc9b528a6763633c093cb008805591/jijibujafaxit.pdfIn PDF document text
    • http://redactron.com/userfiles/file/92215725576.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/babodoxikakikoseva.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/6829810281.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/lefijadawapizawizojom.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/j27b89rps1iecirmoghef55ud0/29528995981.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/79233056204.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/33445290359.pdfIn PDF document text
    • https://sanidom.pl/img/file/87146122149.pdfIn PDF document text
    • http://taxfreepoint.com/file/5766412389.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160def98547e8c---zuwuvetade.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/82919503803.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/19596923209.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c61ec8ffb---mitulifemizesakub.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609673f6e283b---14900743513.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6649bc0e4cc3dba52dadfa8c5f4b283b/54575950078.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26429a84d---42724103958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=1+kg+gold+in+indian+rupeesPDF 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_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 10616 bytes
SHA-256: 549b855de4eef30a9e714ab4600432382bd2915b2303dc2b70f73c4c18f4bbf2
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 18192 bytes
SHA-256: 84e441f6cb947c036fe55e78561ed36156f34c6fd02d1b44b9b16dee1766d0e3
font_02_sfnt_off00012b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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