Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae80c606c8dba56…

MALICIOUS

PDF

89.2 KB Created: 2021-07-30 21:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4b83ec8e4ec0e37845158e01e9ab261 SHA-1: f540d81dd91f4c33b7dae0e62ecf3ba518a512ce SHA-256: 9ae80c606c8dba56e908a662a04b1ecd4508bf9300c5b05a068f71625bcad67b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely serves as a phishing lure or malware distribution vehicle. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and potentially malicious PDF files, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious intent to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://perfecthospital.net/FCKeditor/file/57111677613.pdf In PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9802341b415f133838129411ef821ee2/sobaxekevidodido.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/masune.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609769c7adebd---59139408827.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160757170a6e83---669020196.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/wategugisomadovitoxemukud.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/lezudisovakarojuwevaxev.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/gebetevono.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/69244710270.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608538411bfd1---20775174430.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/30584632253.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe59daa275---71658326762.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/59958490184.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1b2b5faf0---wezawi.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089b49c7e0ee---39572707585.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8a531f6d8022eb56197c627111b5776c/jobapevedorodemoxine.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/50461970505.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dbd6682a175c7796dbae49eb3e342f8b/86573435056.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e94b85e9e---28791050425.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/90362277473.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/67826163725.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/bapok.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/35801625822.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8c4e4314f---sinuguwi.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160800be39839c---bomarabigop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=permutation+and+combination+problems+with+solutions+and+answers+pdfPDF 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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 11212 bytes
SHA-256: f524992713909b1c0c2d2e1dcb18e36615dc2004ee2656905827059b7f5c9358
font_01_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 17948 bytes
SHA-256: 7271ddb38a4e81cbed3a808eaba1f41f262cc3e5b15320fac99783b8f20895ca
font_02_sfnt_off00013dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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