Malicious PDF — malware analysis report

Static analysis result for SHA-256 5569033879cf6b01…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 03:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55c6c647a7d8adfb1c0fd78d27a53176 SHA-1: be7c8d4939ea2f452380b671cb45dd8c2eec03b8 SHA-256: 5569033879cf6b012d07b072e0939db0efdb0ae3fc21b7d1d5e7f934ba7e8133
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, with numerous embedded URLs. While no executable scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ibshop.gr/uploads/_uploads/files/gokojokojanazusonokid.pdf In PDF document text
    • http://temple.mo/userfiles/file/81794132182.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/17752773050.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc36219be93---jefitonerubozikem.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ead55499---70651019900.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/fomezinuzux.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/13083947891.pdfIn PDF document text
    • https://filetorme.com/upload/files/81532758835.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/888a5328d32cdd9517fd83ce21a3ee26/tejopero.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/42854103086.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/6cdpp1m9jo6tms8gevk10onmqk/34787218381.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/63541297634.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/74668519765.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/57683ba2c3a50da74b7a9ed7494890ea/pofowagojumozor.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/77273592931.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc9fb0facd4d4002e597c6c79e8953db/zulunutabepadanafe.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/46943996052.pdfIn PDF document text
    • http://edgecs.net/documents/jadelilive.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/bafulezopemuzala.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021828_3521_431.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/32664371423.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb84bb5d20---3372357493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fire+master+servicesPDF 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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 10164 bytes
SHA-256: b40b651fe965e603e0f6cfc683743c2deed58fe23235ba8ea7dbebb69429b5fa
font_01_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 17584 bytes
SHA-256: 99ae34c20212b1a4254140475d6b8e6d3a18216521df78e9fecd98e19824f16f
font_02_sfnt_off0001150a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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