Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcd0d9012f306c6…

MALICIOUS

PDF

77.6 KB Created: 2021-08-09 07:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee55b6ab14325a29f8c07ff21824157f SHA-1: 2414c03f9a267595f94bb8547332f48d30fc2ff5 SHA-256: 8fcd0d9012f306c6731377fd5a755ca7c01468f6bc0676674c6f8320e1c7a228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests it's a lure to entice users to click through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://medicapoland.pl/uploaded/file/48118915439.pdf In PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/53395848627.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073fa2942600---fejaxovutolovuginat.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210602201754.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hml7osgrchc426odrvnk9hf881/zutijitilurebutilipogom.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e60401dcf54b746deb5b3bf80fcfa30c/90329147753.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/63320056829.pdfIn PDF document text
    • https://fishboat.hr/files/gulokelobaxojugewamepener.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/39281498551.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/48264987247.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/mopukebadokas.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/14081495404.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f425976417---85802148971.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/doruwodugog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35e1fccce9---nukolilabutejimebofum.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/75149414104.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a3d1282635ad5de0dec9dfe953b6eacf/kejupivedaxuzol.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/baxetijojew.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/82810686104.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/50079881685.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9eb12aa5---fopezufis.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/8144024818.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021080123092273499.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/pikaberarala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+ultimate+review+packet+acdc+econPDF 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_off0000c80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80C 10920 bytes
SHA-256: edca53a6e4ed7fa6f6c0e35bf4b3cc7c4b4d96850ba407848e89ad2db2779931
font_01_sfnt_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 17816 bytes
SHA-256: 5aec9fb37ec3004d4f0022c410172bfb325fff01bf0ec266f20b464dbacc9e98

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