Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6bc5f099489926…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 09:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ed821988e5476aa1cc2306350b758db SHA-1: f7a4a356792aa6a0a37cb2169838f3b49fdf1cbc SHA-256: ed6bc5f099489926e52ce9a9cb95718e35c80e499125e9a84497a813d09e7628
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these external links. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://amblesidewindermere.ca/fckuploads/images/file/56438916089.pdf In PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f84c0a1ab5c---984910875.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d457e5dd05---1352072260.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161277fe98404f---91523714422.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c4475999b---96293862169.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/kigixozurolazatemisip.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a0f7d5d7---laxineruzer.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qliddvnho7f0p9lqjureoaf3ph/bozenegup.pdfIn PDF document text
    • http://soc-in.com/data/media/files/julizobametape.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/wuliwi.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/73580853279.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/90776982757.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/adc55e1edfbcc768381a270b51c24dc2/jokepuvaxodokixomimot.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/co8l3rdit0r8jvefh3b6h3092b/zesozo.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/matikidozokarag.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7e23578d---74870278252.pdfIn PDF document text
    • http://learningkey.org/userfiles/21696137609.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/59c070227499bca5c8ac87b373c84b6b/40992130594.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/34404496844.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/19495656341.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/xuvudisomo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff9f46661c---44161182190.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/78263562427.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d37461b86d958bff81d30eb84a35b7c4/37415438954.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/41901869515.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160943f948354c---42317115456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=english+to+tamil+translation+dictionary+pdfPDF 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_off0000c968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 22176 bytes
SHA-256: 4d0496fbebd0f619de6d79968f1ab36261d17a6652cac4b23fc3c407d5d3ec2e
font_01_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C6 11032 bytes
SHA-256: 1a825350bd526ef6ff47bcd75d808e866de8a3b0c94d0cfb3cf0421e9658b60d