Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2845a8a4edc0823…

MALICIOUS

PDF

97.7 KB Created: 2021-06-26 00:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 605bed9bc29f4a5ec548dd1fb42da35c SHA-1: 7c9ce2c25dc1ec5e138b8c354deda8144732cfd4 SHA-256: c2845a8a4edc082333d0f657bc086d7e5edf30b1fd816a22a640c35328d9d9a5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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 https://memoservicesrl.it/file/82492288084.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160d64c02a8170---74489100693.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6cecedd95---fozosotodabib.pdf
    • https://burgas-remonti.com/userfiles/file/1651811795.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e47381lsg6mgvovtrhc8cgcrb/58483429888.pdf
    • http://sobinco.cz/ckfinder/userfiles/files/ruxotukozusitexum.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1841c2a0---radisovasomosexejexajuzo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609176c808a70---43103200127.pdf
    • http://antifftech.com/uploadfile/file///2021050119094660.pdf
    • http://aep-tc.com/cache/fck_files/file/8758559487.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47182c4180---famupifazadopujimamumek.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/762e60353b13f7da1d7497499c6c3770/jonafepinilelepinuxe.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///zonigulera.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/08a861c9da5811eb621fa3c217635b0d/zidemejulapurupesiril.pdf
    • https://seeandhearbetter.ie/img/shop//contents/44225276288.pdf
    • http://cs-web-design.de/ablage/userfiles/files/zevakalimori.pdf
    • https://bravo-hk.com/userfiles/file/87021903472.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e58ea8158---tilixodawexuzizolub.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077724680012---29545815065.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/47676677226.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f05f71d73---77162882966.pdf
    • http://musorcentrum.hu/files/article/file/gumesarilojo.pdf
    • https://menlopark.com/wysiwygfiles/file/43221243694.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/n4huf9082qiprm5s4e2e1ukr93/mufuwaziturekeke.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=philips+lx3000d+manual
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd73.bin
473a16836e17a8aa294f4a656940b0f1e6cd518deaf060e8085fa0c096e10626
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 21444 bytes
font_01_sfnt_off000131aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 16792 bytes
font_02_sfnt_off000149c1.bin
c627cdaf6e31aba2939998db10234d5e1fe1506cfa32efefd6a91c2769376028
pdf-font-stream PDF embedded font (sfnt) at offset 0x149C1 10704 bytes
font_03_sfnt_off00016208.bin
9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40
pdf-font-stream PDF embedded font (sfnt) at offset 0x16208 16236 bytes