Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceef26a54655414a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 22:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c43df418206f22b0f17b57e0cb7ef802 SHA-1: 0bf81b9c8fb9e0512c3129e710d1f9b2c67b14dc SHA-256: ceef26a54655414ad35cb2d347972ab3f18c7df8edf069e78359c15d65ae7a48
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phishing pages. The PDF's structure and embedded links strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eb49104ed---46345024427.pdf In PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/28410690291.pdfIn PDF document text
    • http://greenbrier101.com/userimages/koboxederegobamodike.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/71811213708.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/60254012557.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/94c4eea04f4c775a786f7cd4abd75c29/vipupuwalew.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/59101366941.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/dokebafebepuselu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612afd80ac807---sujorutijosefabega.pdfIn PDF document text
    • http://forti.in/userfiles/file/serupo.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/ratovawerunadanuvoxibew.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/xizivilovigoresegixa.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/79290886560d9b9fcb1650.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c20841a3f19dfc37aa3f6eff4d6681d7/59733956253.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/1ut2trmih0ci10ge5e633enbum/giruwiwovapoju.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/oova7jg2cr05683ucqmvk4knia/92096595863.pdfIn PDF document text
    • http://metapolar.hu/tmp/93855850982.pdfIn PDF document text
    • http://grandfiltr.com/files/file/sekikudo.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3ca9b578a---5941520297.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/wawakubin.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b6dc8f0895676d1544ac6f2f3f2c0740/sojitivuxalole.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2465fbbd16428ccdfe10985efd5976e6/48858908093.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095e22508f9f---sinezawekitosunawodaruxud.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/14425632155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=braun+type+4045+coffee+grinder+manualPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/177a4ab266029c8e15db92fdae561c81/muxolatibiwujufifetabi.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_off0000cd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 11396 bytes
SHA-256: 5cedb25b7501cfd158f59a6a48cc9a76ea8c3a39e68ff88410a1fbfb83494c1d
font_02_sfnt_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 18536 bytes
SHA-256: c7fab966980a3a4b5e7ed5a8aeddec78634332f4db96c27ae0f44ce3c79f6585

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