Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc17897132b3ad4…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 22:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55a4067a3a214463d7e9850049f7e7f0 SHA-1: 39cb757d12b6e649d6bee9a5758ad38ecbced37f SHA-256: acc17897132b3ad43179463fafc66a1b92eb4e4a143cd6dc77d21d3d374ab186
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These factors, combined with ClamAV detection and ML classification, strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=vicious+cycle+of PDF link annotation
    • https://aptitudeclass.com/ckfinder/userfiles/files/lisajetupasabogebimew.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/3511603684.pdfIn PDF document text
    • https://everestart.com/images/stories/file/49664116229.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/66898065027.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/xesikokonejijaza.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429938cd83e---gokivaxunepaf.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d234e54374---19162347442.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f86b83f0909c9b8c2557f34f47dddff2/wuxegowon.pdfIn PDF document text
    • http://eko-uklid.com/files/file/siladasevonugidapopak.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144a985c34dd---63778114031.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/piwovudedemimupasoralos.pdfIn PDF document text
    • https://legacytwirlers.cornerfamily.com/userfiles/files/36579236692.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/66438915483.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/29331841861.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/pimuderig.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/ziwosaduxivup.pdfIn PDF document text
    • https://afma.pt/site/upload/file/mulowezonika.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///70803432664.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/tudagodagedidarokoxepopu.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/84045499687.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/30872817412.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/83783199193.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/rodoxitasekodurosizowob.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/70098670787.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB06 16184 bytes
SHA-256: e3a0c32e7bd8efc4d50006299e6b39d4ec1f28fc6273b5f9e3430983aa3e4015
font_02_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 10048 bytes
SHA-256: 8d0cb023b4f2eef749c55a1ce51df326351e60c77dec51554cb0b1b52dba2a7c

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