Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d299835694f41c5…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 11:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd8ccf49c5f1643b66e93bc4b2acf15e SHA-1: 9c84798692145c613c0f5d86ffccb1fc82d8ac0e SHA-256: 7d299835694f41c5e9c6fa4594d4710eb9c0792cf07e713cad31fa6430f76168
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, including one at http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423c5bb4c79---73220704643.pdf. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423c5bb4c79---73220704643.pdf In PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/81663271177.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f30b82b7a6---35836396096.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/wofeferuvagimapemozowu.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/69914676440.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/pasotufajivugez.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/resosagox.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/qk0lmv4ppsmkvmrbmnmvli8bp3/55276601875.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/laruxekujepewepixewap.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/diwaxegowejowesasi.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/pewoladelajuw.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/64600640270.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61f2a99f8---67983107656.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/gosiwesibagaridajosi.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/xibapizukifunug.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/wamejozimilunudi.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/rpt0t57vgh3tffk0pnbqlobpek/wasox.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/55172496543.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/tomigur.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/tazivodaw.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/wofixaludolefi.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/xogemufepezutonimogetiko.pdfIn PDF document text
    • https://fasleh.net/Files/files/22888086036.pdfIn PDF document text
    • https://ayurmitra.com/files/file/bobuxagikuzuvux.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/simujapun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=khaab+song+download+mp4PDF 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_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 17608 bytes
SHA-256: b5c393bfc69d3ccb7a7735f7e890c8add254aaead71688d99287ae5247c62101
font_01_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 10712 bytes
SHA-256: 82d2ee9484e3d17367a7df59c9438dca30e3a2d3e3bdc541602534c56db98c07