Malicious PDF — malware analysis report

Static analysis result for SHA-256 a594e6e5db096ae3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 02:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7bc7a18a1f1b68c081d3d2e302c634e3 SHA-1: 4cc0c379ef715b762e2e0ddd5bb55ef9355faab6 SHA-256: a594e6e5db096ae3df752da16ac2f0e8ce35f4b2e27f0a1404c798a1e83f0f5c
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

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 http://mya1fc.com/files/ckuploads/files/lodunuzigomugifuveb.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8344011e0746b3b878c5265c816fbec0/98610172575.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612af4b935bf1---wovirumopivelasuzu.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/0bbc36b1c6f459fdf928260a829401cd/95658600410.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/23110537602.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ck6iggk4fmfkohstq5nli27psj/69648476138.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e709b7627---xanakunubevudalud.pdfIn PDF document text
    • http://termocity.by/pics/files/19580819663.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/4a9813b785ef1e17e4f772fe72a3da9f/93407248208.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/lobomidolurifizimunibiwer.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/34204565379.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/17cd872e2385bcfd3444946659a225e6/puvozubufagenami.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/10698506136.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607895e63c50f---56649732582.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/89554724061.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/32799866776.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/32756039677.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/xaxuxeberefad.pdfIn PDF document text
    • https://people11people.gr/uploads/File/30783275118.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/21635524308.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094409c3b98b---gilobovepuzokimozumiwokev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=calendario+mundial+rusia+2018+pdf+para+colombiaPDF 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_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 18652 bytes
SHA-256: 3fa94f94a0252a48586a602556ded7875655194457f8d7c05bdb44ebf8b40da1
font_01_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 11456 bytes
SHA-256: b44246f3266e22d0ee9fa5cad14d5d1662dfae71c6977d612c39fadbf5df1564

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