Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fe55c645cf45a2…

MALICIOUS

PDF

72.4 KB Created: 2021-09-30 15:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2ead0627976d3f0480d75b86fe44aac8 SHA-1: be64b2f4bfb7f99fa015f5b77a9cdf4b47c1a2a1 SHA-256: e1fe55c645cf45a2ed704d6cfb81b897d5fa4aa020d749a0ae91050e241ec177
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and compromised CMS uploads points to a tactic of leveraging potentially untrustworthy external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=how+to+use+phone+as+keyboard+for+tablet PDF link annotation
    • http://smflow.in/admin/uploads/file/89830921535.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bddd3f146d---folakebanitoxavidozot.pdfIn PDF document text
    • http://sswjeans.com/files/bitijifimajamepodesaxi.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/rodakeniloributo.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/gokifikiruzetukumexi.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3674f031a779cff449add52e28ee5bc3/42358094215.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b756486e8---11624544221.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/puniwofujinav.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/fokizugonatex.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210927042733.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/gewumunumew.pdfIn PDF document text
    • http://prmakeup.com/Image/files/27723255556.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a5ea83cbfb2bc8df202a60873a5e68c9/womimumisaxudemenejukonit.pdfIn PDF document text
    • http://bancodevida.com/bancodevida/admin/images/image/file/pokazipewobip.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///rawobusinijivo.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109221647358146.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/gupajipojefiliwofeludef.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/tijevapega.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/56344781051.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/16731755904.pdfIn PDF document text
    • http://apart1day.ru/file/30895700771.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/104ff9d8b8fe0d84f4e3fa168eb76f10/6767588217.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_off0000b511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB511 17676 bytes
SHA-256: c30fb85bf9414572a0739364ad9725a219ad2cb68c33dc3ee66d9ba63a7a857a
font_01_sfnt_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 11028 bytes
SHA-256: efdfcb1c09f816d7bb7f56eb0d8afafb831d7648dd16bccdfe111e72fc084b17
font_02_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.