Malicious PDF — malware analysis report

Static analysis result for SHA-256 7211f03b77a9b00c…

MALICIOUS

PDF

117.5 KB Created: 2021-06-28 05:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c1fb05cf84ca46ab2978b5ce07b2a718 SHA-1: d30fc8d485a9011ba6de1212c2c0ce65239ae432 SHA-256: 7211f03b77a9b00c238415ef64f5d1774e1fb184e9b1e4294c3b3ccdc953bb74
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of multiple distinct hosts and a high number of links per host further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86ae7b00b---xosedizinimufazudigov.pdf In PDF document text
    • http://myredm.ru/uploads/file/83182676620.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d205162b4f---73569171820.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a285d5c17a2---gidemixojizetase.pdfIn PDF document text
    • http://apvn.info/userfiles/file/25309541673.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d235b1c5d8---82493940861.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/18700550721.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ef40215481c657dc89c62dc8cbdf6c22/faxuzulumumiposi.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/51082927785.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/20249420907.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/33905106256.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098864345789---7766385007.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/55749340590.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e77ced4305---vurulevudub.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bceaf4a89c6---96435516508.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/pabevilunepudiwisefenupes.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/ramesezesakemefobagenazer.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5242ef7d4b10ca7775f5b58cb6c67a50/1453941933.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/14114606004.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7cbb5149a---lisesexujipezazorav.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a772ce76531---wufepewik.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e34e7d558069233745473730030561eb/kusaritesaridaneberoxijo.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/64924891328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+rogue+feministPDF 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_off00016655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16655 10516 bytes
SHA-256: c27785b9431ed83017a13646ee6d68a13674e26664ea6ef0d4bd171fd82550a1
font_01_sfnt_off00017e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19639 19612 bytes
SHA-256: 5a0a2b7ad65490891f6068ef14e0c9394e4aea597ccd5747b6e5a806a9e29f55

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