Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d41135ae536a2d1…

MALICIOUS

PDF

155.6 KB Created: 2021-07-07 08:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f49f6a5d400ef1dfff477a6bd62f7e45 SHA-1: 761f8366781baebcaf7c006f320b470f8fe0f030 SHA-256: 8d41135ae536a2d1b489f946026a6587422bfdd60063c21f983245fd57298083
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It contains numerous links to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded URLs point towards a tactic of using compromised infrastructure to host malicious files or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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://ketchas.ru/uplcv?utm_term=maplestory+ds+english PDF link annotation
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba70e7369---48309667040.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f73c047b6a16913f956dbb499da9f12e/dawonuzegemuwapepoka.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942cdf7dcfc---92442971628.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c305a1047---84263012411.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c687ae038dd---33399968995.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/7a103989ad5bf9f2fa08be5c7c392482/fegusanapu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//pewusasovefodulujomul.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f08b17e21---38821132314.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8ecmu8mcnics4i1argsnju3cgh/gorurobulifirilogaxidiv.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883a44e9db9---rafilosikufimipetomage.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/xojekosuxo.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a3b4bc9f---60555607388.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6758f295c---69516702434.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecae4f0f69---zivamofavujumoleno.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/78646433024.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b82390e0f6efe4a54c33d997e1344a20/nozadowupawifadalavetale.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/nasewagiwuke.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/e4e3cfd3206229af6e4f712a01b3f685/77671374738.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/figutomekaloralivoxugiwum.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/zalugowilapixunom.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608857ec105d6---65915482726.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/balorib.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/22106109498.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7c3a8ab33---foxazimijoped.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9cbab44b807885750bddeaddf06aa8f4/tuzajizudozupisuge.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ee23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20630 3812 bytes
SHA-256: 1c79def0cc7f5e206414947537921af6b7bc5e5d25b0586ac32e2e5f896cc9ce
font_02_sfnt_off00021543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21543 18436 bytes
SHA-256: 5b263154be6b89b4ec4ce0901f58196edb2af69d760eea67e703aab7353425de
font_03_sfnt_off00024627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24627 10776 bytes
SHA-256: 241b1cc63b15ae6ce8a4e96463468ca1acfb2082fd12cfaa149d6cbb1ff0f4fd

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