Malicious PDF — malware analysis report

Static analysis result for SHA-256 04312a4b364e443b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 15:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dad5732588de4bcb4e81b7632f5023ee SHA-1: d735399bc41c027858d148bc8ad00789e7efcc2b SHA-256: 04312a4b364e443bb3384bc21cca0886f3e6d92f8811975ffbf764642ea005a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics suggest it's a phishing or trojan distribution attempt. Although no scripts were explicitly extracted, the nature of the URLs and the ML classification strongly suggest malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=live+beach+wallpaper+android PDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613239a00e749---5173007535.pdfIn PDF document text
    • https://nevisnews.com/userfiles/bavodawivukosukiba.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/51263459032.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109112034523696.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/wusexipi.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210910182443.pdfIn PDF document text
    • http://khocabien.com/uploads/files/sekebi.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/38310704182.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/10792235210.pdfIn PDF document text
    • https://fong-cai.com/upload/files/33199363659.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/siwopit.pdfIn PDF document text
    • http://thevalleytrader.com/files/mapevonevaniseteki.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/mifiribajo.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f68a1370c4---rujadiritutipataxofowuju.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/romikilakefos.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/45117825759.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/lirewutinesexavipijamada.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/setivejezeg.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/jojozitakapesomoxevexaku.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/36231650158.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/d347dd039555094d1989785942f49694/gobijafugivofiza.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/70992006533.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba650f2a57---71204494506.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b181880cdc---woriranomitaxufetega.pdfIn PDF document text
    • 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_off0000d0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 10592 bytes
SHA-256: e8879935d864614fff970dcc1b2cc635c6b13cf2c9c96ad84b3ef8c0e711d153
font_01_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 17132 bytes
SHA-256: 6193ea017be7d87970593bf1853c2ec6074aaa5bfaef2aab5d004ccc30f0df4c
font_02_sfnt_off00011521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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