Malicious PDF — malware analysis report

Static analysis result for SHA-256 8182596a56d6dbc2…

MALICIOUS

PDF

73.0 KB Created: 2021-10-01 00:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e63f752212f57a08ab5364973e573aac SHA-1: d03c0b038cef5eecfc6e7e3319f68bc0f6cb8fdc SHA-256: 8182596a56d6dbc2d52e30c1bc3a0063835604e32947b5e5c8c0a357cbb91276
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites. These links are structured as a link farm, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a08526f621---5333209690.pdf In PDF document text
    • http://somsit.com/ckfinder/userfiles/files/kirirowapi.pdfIn PDF document text
    • http://htwy.com/upload/file/pubazor.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/33982517131.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/97313895291.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/1381088970.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b4f7d769---leziporanobiforawufufip.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/ramebilolawuxoxetupad.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/mukamenip.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/vurazifubatodu.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/zizoxeb.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/os5mfoc7uu8pgcc0bogcg9dleu/30338940757.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/99330950393.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/vudekigulozavifi.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/30793149400.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/m1cvovccqkrtvuv3669d42mqvf/742610733.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/11768385885.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/lixilaxaguj.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad13eaaa5d---satuvanura.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/vezodavogutezovumotodaxe.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/tokuzid.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/27676444519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=penalty+shootout+game+frivPDF 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_off0000b738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB738 17516 bytes
SHA-256: 8b35c2dc894c4e84dec0478ad851641d8c5c50c0ac3fed89b06e01064f20c679
font_01_sfnt_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 10940 bytes
SHA-256: 2f7936dd1cb60c88f51159bc9a793089a499b14555783d147c5304d96b6c44ad
font_02_sfnt_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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