Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7533d0e68d47579…

MALICIOUS

PDF

69.5 KB Created: 2021-09-17 15:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50ec9eb533623506fefa75d38cf9a995 SHA-1: 13edbeae68e8fa056f65aabbc53dbd0d8aaf1853 SHA-256: f7533d0e68d47579330d57bb6530404823074e9d1370a318bacf58edd315f691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains a link farm hosted on compromised WordPress infrastructure, directing users to other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the presence of numerous links to potentially malicious PDFs suggests a campaign to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613371b309c73---94891248167.pdf In PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/ronovijarenudavuzulu.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/28938220360.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/78134918937.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/22847756354.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/zopatisoroxikejexojukutu.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/39841770399.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/xefadebir.pdfIn PDF document text
    • https://denimder.org/resimler/files/25702740511.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/58841696985.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/36684887691.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/58037367023.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/nimofevojijefexonoda.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/62123060134.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/34758949215.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/buxifavojapazak.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/46a64dde58d28daa048a5ce1c434278f/zizakis.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/paxufewipigumudusutit.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/dupifadilowekakilanat.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6188b177f---13209028626.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/dd8444e4e00d703504367fc26d9e11d6/43932597566.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/53066876520.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/19394266530.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/retaliwisiki.pdfIn PDF document text
    • https://gdaniec.com/upload/files/xagor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+regions+of+the+electromagnetic+spectrumPDF 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_off0000b276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB276 14488 bytes
SHA-256: 4c91cceb473381cdd1a43e4b5574fb470231e4a55d83b10b6e5932c70242d77c
font_01_sfnt_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 10988 bytes
SHA-256: 1c68a876b7e27aa9273ffbcb0d741461d8b06033bc888633552e2812130f0741
font_02_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1