Malicious PDF — malware analysis report

Static analysis result for SHA-256 1054e0abcee081b8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 05:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b80048d630cafbbdb951d1207487a67f SHA-1: 5582801bdbd428d844ad7ec1f525fce3254882e3 SHA-256: 1054e0abcee081b82c44b999f33d28b87211994a761e89187876cf78da3893e3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://panziofabian.hu/fck_kepek/girixosuwiwepoxur.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ceb7af4dc---31307398926.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/34761205860.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/051144336205.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/wefamizejifarosit.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/pqkeq8dbef2q2g4295tjcqqlh6/ruleseluj.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/32332497126.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/4639047015.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/43435477996.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/17964622543.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de13c3c20a1---zebemawafunuzupibeto.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/39735462488.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/33479480825.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/64146048608.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/vararelibipuneviti.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///20217281527307873.pdfIn PDF document text
    • http://compsult.net/userfiles/file/13370418400.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/golegolidoni.pdfIn PDF document text
    • https://cristalensi.com/public/File/69860678387.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dd0dccbc8bff13eab4381e837aeddb1e/gotipitezor.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/36112283611.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d25200b0f---19806549968.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160910e756f94e---20027681310.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57cd2421ea---78857441685.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a22203f40---zapixugukusizabam.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a855c22c79---waruvijejuseb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=theos+fine+kettle+of+fishPDF 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_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 10104 bytes
SHA-256: d003476644e574f38f8e92c72697cd74d8b41310fed8df0ac59bbf409faafbce
font_02_sfnt_off00010d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D49 18980 bytes
SHA-256: 4799644628f5ffa281ed0b2d6266235093ff440e4a8e24b3f3e72650949dacb6

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