Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f6da61a00328e6…

MALICIOUS

PDF

86.9 KB Created: 2021-08-09 18:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36940ea8af70af3851a32cd56d0d567e SHA-1: b3509890bd99f55e7594f926977acaeb579bccc2 SHA-256: d3f6da61a00328e6a03fa3eeca7a853cc087358c004a968de010b20b6b4d3d4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. These links likely serve as a lure to redirect users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://synerhu.ru/uplcv?utm_term=new+punjabi+movie+ardaas+karaan+gippy+grewal
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/f0e6ikqivqj8e69cpaerm5ggra/fabilivepuvasepivukim.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3entrsmogi1vf0rqt45a19vi2n/najuti.pdf
    • https://snoman.mb.ca/ckfinder/userfiles/files/tigamutirol.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/s2gp2pdco68gccjvvje95k762s/63972796565.pdf
    • http://kppzp.pl/userfiles/file/terixisanalunafakevimuv.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/bh3ukevs1skt3dfkk1rgmstl8g/nimafuduvoterevasemeb.pdf
    • http://inwallendorf.de/userfiles/file/85265490331.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/36a5d212e50be1088150e9df221f4c50/romiwolexidudaki.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3c00d164079c247672e8f9f41d9ea0d9/84620164516.pdf
    • http://lev-steklo.ru/userfiles/file/98720718540.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32d6a8ee3---22125804922.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ojr4oaa9tcoe1dv48j7s5gs7n2/75569634029.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b6840710f---definip.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/vivipixaniwizezojafo.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09901521a---vigotikibebubidufagepa.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/96c3a4436af3b099eec81340d50098ab/10363348066.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f13791a5b6---texaxanufagun.pdf
    • https://gloriouz.in/ckfinder/userfiles/files/zirunibarowusewor.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4b96edc43273d7e17346566b60998c3e/komibopadup.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092411f79908---lanuxexikozabuvupibuz.pdf
    • http://romanakladatelstvi.cz/userfiles/file/jixeperugobudomatodoviv.pdf
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/76129450411.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9b03fe8d9d479411d3a34cec8a86816e/kegorosijumineko.pdf
    • https://kultmotor.hu/images/files/26985645554.pdf
    • https://holocaustresearch.pl/nowy/photo/file/70526583480.pdf
    • http://albarossa.jp/js/upload/files/85829953.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 16792 bytes
font_01_sfnt_off000101d8.bin
a5f5152d8f16e254a7d5abb4ed7e47d8fb78051c3493a52331776b23a307b675
pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 17820 bytes
font_02_sfnt_off0001308c.bin
c357c1f60f496c0483ee602ab4f0a5a16a4ce611248c22bfea0fded9fd14bd8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1308C 11344 bytes