Malicious PDF — malware analysis report

Static analysis result for SHA-256 155e1aa88f9cff9f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-30 18:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a413cd3dc375d6e547760640927128cc SHA-1: 0596345a1fbf53d6c267172a4a1d7a8c864ba00d SHA-256: 155e1aa88f9cff9f03767a7a4cd852b037c46175bb8837e731e0ce4ee309612a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=international+fashion+stylist+dress+up+studio+mod+apk PDF link annotation
    • http://vdadanang.vn/app/webroot/assets/files/21450754943.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16151e02e0d9b1---8792015000.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/jelirokef.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/91813468825.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/misokojevunubodatugivid.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/bekaxom.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161499694cb04e---67373476058.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/9819865910.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c28bde64ba---mawonomalajatoko.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/tafofevupazimegajojosajef.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/bebusefoxof.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/83192139486.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6b110bc5670104f6334a579aac8fa520/jelidiliv.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/xupozodozamiga.pdfIn PDF document text
    • https://zzhqhi.com/d/files/28401847471.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/rawotunatekugili.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/2065610604.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/pekelapefefawi.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/rememunepovuradaxafenotu.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/98789157608.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/87188775402.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/26262837707.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/17629981031.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_off0000bb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB04 11020 bytes
SHA-256: 37af2ca9710bf14ca07e3b80d06a057fa87d36f741029bc46c75e6861f1277c9
font_01_sfnt_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 20512 bytes
SHA-256: 21e620c9fae626693de9c17aee08ab802ed30fa274b3a5c4e98b6c6f8af8d263