Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cd3e62d327cb44…

MALICIOUS

PDF

71.6 KB Created: 2021-10-04 06:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3cc43708f014f8c4f48330e875ef9975 SHA-1: 5b9e1a43820a40a2fa8feb4c6d8b4c2a3ddb2236 SHA-256: 63cd3e62d327cb4438ad949d49123e2b9978c7c05ed7c099b042feda1b92c46b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://mp2020.csysadmin.com/ckfinder/userfiles/files/seful.pdf In PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/43705181075.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/2059099303.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cca6106567---jomagoveganago.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/66198524193.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/25354425630.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/67491661244.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/rofawu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139131cb6627---52197082479.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/90818189906.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/8545136499.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/lowuvimepego.pdfIn PDF document text
    • http://cartopack.be/Images/file/48523901721.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/mujevupijokefutiguzifujeg.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/gosamuxorotikojupex.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/rawevinadif.pdfIn PDF document text
    • https://hoavily.com/uploads/files/49902963630.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/wegezuvux.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161378d7e5adeb---motijafov.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/26184154633.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/dejofoxifesovebogamazeg.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/kubetozupilekerufanenu.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/kofajavimeluruvude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+if+you+lost+your+birth+certificatePDF 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_off0000b4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CD 10676 bytes
SHA-256: 0fce591297d5ccfb75cad19de153d5167c684132329a3cd20816e05bea590f10
font_01_sfnt_off0000cd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7B 17040 bytes
SHA-256: 7b010636a55df9266cbea228bb8f2ccdae621c714bdd2618b32af135fa5abf3d
font_02_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1