Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec3c56b08cffb34…

MALICIOUS

PDF

83.8 KB Created: 2021-07-02 23:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac5bb6fe4694ffe5593ded9bb264acff SHA-1: e286a92db15d7ee600addfe8dc324784577fa9cb SHA-256: 5ec3c56b08cffb3460b69e6c1fdae15dca23e7f6c26971a56fe96d49f79efc19
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/pdbup129pir03vnn910qljm7ht/megudazajagokesibegovu.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/15376rq28gs71oomrimg832fj1/91062421207.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4df8ef3f55---jubajafujerenefu.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7da1ccf143---37185976879.pdf
    • http://absolutelyneon.com/userfiles/file/679094837.pdf
    • http://bosch-service-center.ru/uploads/files/15008119545.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ebcf7157c914db6c251d6865a1cdffa4/xaxasexenisonelijedexedo.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f69d52b562b8606817296804709aa48f/11387479444.pdf
    • http://poltinka.ru/userfiles/file/bezixu.pdf
    • http://sixtyguildersresearch.com/admin/photos/file/zesobufulivevez.pdf
    • http://lawrence-spruill.com/clients/42275/File/linedil.pdf
    • https://kodcomputers.ro/2664/uploads/lifezimawatikoxipapitaso.pdf
    • http://vizcsap.hu/files/file/73986289072.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/da843b79ec8a9f3a30f69fa377e10093/pevitexogalowodumesuwiba.pdf
    • http://solamsys.com/userData/board/file/sokopovabawuzu.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af999717a2a---39437514075.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084af59d692f---midovanozajuxaxaduge.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e3a604796---94542769003.pdf
    • https://avigailpekelman.com/sites/default/files/file/79993739685.pdf
    • http://banhangcongnghe.com/upload/FCK/file/87504496024.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rf46nh1a2u3i05gvfnsc9867mo/68961097751.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=subway+surf+free+coins
    • 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_off0000e621.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 16792 bytes
font_01_sfnt_off0000fe33.bin
d7b050196309f58b66a389c40262663fa21dc418888dec0088afa7711246f3ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 16644 bytes
font_02_sfnt_off00012988.bin
6a42e873d7032a7008ae453c45f87b651506ce2023af160d0b964d6011b9c698
pdf-font-stream PDF embedded font (sfnt) at offset 0x12988 10700 bytes