Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea17af679eac9c9e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 23:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4706240178349188e5152611086bf7b9 SHA-1: f435265662162f300890ebfc4694c8886b836bf0 SHA-256: ea17af679eac9c9ebed593dfeccb44531fc187ea09234cc91a67249a58790719
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or redirection mechanism to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to direct users to potentially harmful sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd29cb9131---fawebivowisisuvejabezal.pdf In PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21c0bb39d8---wifafaxi.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/gozibaboporonitu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16099ead16b420---39719457992.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210817194317.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/zodafuka.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1610136bd1aed0---7851046380.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89448f200---49610393526.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45c49e8d5---rezorubulonuposifosipezul.pdfPDF link annotation
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/542ikrnr9ttlgamhmn1hun0rf4/tupepunaxadomusegaforuja.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608794b41cb40---78915440827.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/37366613677.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/bawidimizowavivixubomo.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/sikijexidupezave.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/simaxoderupu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2f4486284---rupisulutonibadaveniv.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/lavefijojalutapebilekumo.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/pizimubodomeruronuraxe.pdfIn PDF document text
    • http://cartopack.com/Images/file/rewiximim.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/dabulukovisugaxakudatomav.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/zilosixamanizo.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/mumokeb.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/kisotusewajanipos.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612b496589a8d---14499576149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=investment+portfolio+example+pdfPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/bumefu.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_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 10780 bytes
SHA-256: cc24c1d0fa8372e1f9b603cee3e96770da75e09cbd45856b427fe69208a5a14e
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 17568 bytes
SHA-256: 9c9f1a6c8b2eaf77ef6c07109d3ab51d26fcaf823b1307e57936f9610b97ffd9
font_02_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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