Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca3f214707f6425…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 23:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7707f7a41c766664603b293dc4cfb55 SHA-1: 436c509eb69d37dab9e2b19d7eaca3beb553bf4c SHA-256: 8ca3f214707f6425092e726e1a0d096d5c3de99403a93f80b055e1ab22b6ab2e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs, which are designed to appear as legitimate resources like tutorials.

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://irlanc.ru/uplcv?utm_term=audacity+tutorial+2020+pdf PDF link annotation
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/begos.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/51441910866.pdfIn PDF document text
    • https://adikkedua.com/contents/files/lotobixafid.pdfIn PDF document text
    • http://espicycooking.com/files/file///82405028490.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/punozulonugelamodumafor.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/48931906360.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/99723338900.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614062d00b2d1---zuzakuraviwusokav.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/betelukubolaxed.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16143ddda54d43---pixogizu.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/sepufibig.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/puwilofipag.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/lisilivuxurejiwiweto.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/28117170374.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a7953c4dae46615214ac7fd28868a6b8/zomemez.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/3855725112.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/56384877079.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464a88b37a9---37447849723.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/1211259054.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/mumiwage.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/ligeriwadabe.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/zipevojamiwobuveleniwixiv.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/pitavepelup.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/tovum.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/47678894936.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_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 10644 bytes
SHA-256: 3fa67c3a30c5a9e02050d7ca771bb53543fd06a97fcd81b3cb1b9cfaed87195b
font_01_sfnt_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 17892 bytes
SHA-256: 1b13a65a5eab9227b006308fe3972ab69bdd4ad932e8961e29ee2475fd6a6634
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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