Malicious PDF — malware analysis report

Static analysis result for SHA-256 b504f59ca0f81008…

MALICIOUS

PDF

86.8 KB Created: 2021-08-18 13:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3552c4b86680f3b6a620db9dad6733f7 SHA-1: 42723da2574f235ac09639ad86eda3df969cbd3a SHA-256: b504f59ca0f810081710eeb503a6bb0097da28d1717ddd7472a5b3e9cf3d250a
164 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through these links. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=report+card+comments+for+distance+learning+lausd PDF link annotation
    • http://gasthaus-steinkirchen.de/img/editor/file/73717955679.pdfIn PDF document text
    • http://kd-council.com/upfile/files/tumibelimoxigumo.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/44979458086.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/falowexojikav.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/mikot.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607516a709fd1---23526135214.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/060176263m9ml3532ed7veq8b4/wasupibasinifukiwu.pdfIn PDF document text
    • http://4bx.pl/public/file/katigurojara.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c52f2686a90---47321494463.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/bb05d8dce60d105ac232b6e4375f99ea/62581619725.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/85574820830.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ce4221f2eb---xinufodufizuzijavimunufe.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/291509293813.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160802cf2afce0---75590384128.pdfIn PDF document text
    • https://cpc-serbia.org/js//files/34702089680.pdfIn PDF document text
    • https://mimpidia.com/contents//files/wumef.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/lulokowidepilonawufonaxik.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ss2345q5qpdnhj2hrf501v4h8j/zukelesolugiwujebudonened.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/84172ec476bfbf68e35cccfb50c9260d/tuvagavuwukuvumikuv.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f6da59afca43f3fcf893eb9e25e4dd58/kaxutinukaxivegugosaneked.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080a19aec863---tipunovepavupirimedafi.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/romotaj.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/81162363001.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_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 17372 bytes
SHA-256: d8fcdec09bc8f8b234508be7c66fac921ad1cefb1d812fd80ca5ebb8156959af
font_02_sfnt_off000130ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EF 11108 bytes
SHA-256: 8332995bf33696812c4100ce174546f8db703426a7500377150c79d328f989e8

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