Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d9ed5cedb9785c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 08:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec53429cb135b88be3ae393f8be57c48 SHA-1: d05e668146d8c19e528d5ccc5570b87caf4fa321 SHA-256: 38d9ed5cedb9785c60c9a8c00f37f219e153e8db49c104fb32144c527bde1c0d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URIs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent.

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://coretry.ru/uplcv?utm_term=las+pinas+bf+resort+village+zip+code PDF link annotation
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43d3d737b---85219812439.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/dafexavuviwukaxovi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6a6635df---damisagisenapozapog.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/24860284081.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/wimoxenopusapetetodefesef.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/netugi.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/dusokeka.pdfIn PDF document text
    • https://tpk-m.ru/files/file/jofubemorofor.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/98950244121.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d76708010---rojivezomegupop.pdfPDF link annotation
    • https://orderpoet.com/ckfinder/userfiles/files/lisobunalosizidapuzoxu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140693f03cce---lululefunupoguwepu.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/fogikapukepozesikofujova.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/13699878990.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/49063514566.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021912133643461.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ed0e41f16---9022395807.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/21418366633.pdfIn PDF document text
    • https://geloracinta.com/contents/files/raxiwesubajamepo.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/88193672606.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/zubinozugovodirewova.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/99081173263.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/18644415640.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/tutaxosewopobenamovivaw.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/82020827085.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_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 11020 bytes
SHA-256: 841e7b9ade53db9f116ee42e5af9d364ee91dae33ff102bf7989b42b8e64f0de
font_02_sfnt_off0001157b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157B 17464 bytes
SHA-256: 1c0ac159d1c8f2a21ffd33cb9c333de5372bd84a6c6d60f03e8a376ae39849b2