Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df444f15e2925b6…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 06:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fe571afaf6a8de25a6e32ed108328bc0 SHA-1: a38f9c8ac00fecd0da3125003dad1a74005683b8 SHA-256: 1df444f15e2925b65fd29b7ae1ad092c1173c2c8e444acf2f8cef988ca2d64bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://mayjack.com/upload/files/32270807855.pdf In PDF document text
    • https://e-casainteligenta.ro/userfiles/file/jisazezuxofudopelos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac48b32cb3---batevalawonatere.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f541ccac9d---95642254061.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/65fa5b4eacac610a6c730e5166aab34d/guvaguvi.pdfIn PDF document text
    • https://tarsiman.ee/files/file/95542109619.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/97240973876.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/mikisuda.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/lunadixomoku.pdfIn PDF document text
    • https://tomas-music.com/contents/files/riwegi.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/48338058458.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/kudabisavasejalem.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/70038444231.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210914_043804.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///goged.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/0rgm979ijikpps7mum3o7kknv0/20024717552.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/vedoliloludol.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/10378522536.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/lodikiwurafonapekizuxa.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/fisimowasidobexoneb.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/wixitarudivukanakomebopi.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/70878643530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=essential+grammar+in+use+with+answers+4th+edition+pdf+downloadPDF link annotation
    • 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_off0000bba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA6 11192 bytes
SHA-256: 1638838e85c149285943d846af4d57945d15285efce5714e3672fe7ab5d9a525
font_01_sfnt_off0000d593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 17172 bytes
SHA-256: 49be4c748ab4f4f4fa0790ec9b6192f89ab5f209ad88b2ae98a4c37910fb7610