Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccee229c6fbe656…

MALICIOUS

PDF

74.1 KB Created: 2021-09-28 09:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac8a29da6e5e4e0fc6b3b65bdfe4e9bb SHA-1: e373bfb9968201cfb3ea7dd240b39e2b022cffe1 SHA-256: 5ccee229c6fbe656b633a4de1695329119408be8739273c57b372e704303107c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614635555d148---tinelutabuvakopen.pdf In PDF document text
    • http://kripasec.com/userfiles/file/jodonekexifufover.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/jijulamiraxugug.pdfIn PDF document text
    • https://nistd.in/userfiles/file/22258411480.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cfad81c0fe---65425158628.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/xudugusu.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/sawasejibi.pdfIn PDF document text
    • http://webbuilders.com/files/file/zinilusipuxekerotazuk.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/42595483959.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/26533470682.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/13516365242.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146207fa5050---45833511371.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/pofititakal.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/winomifogulelojojiw.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/12375745758.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/tugasatedasegawozukinov.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/66870791962.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/52784254080.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/japudekuw.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/62772602158.pdfIn PDF document text
    • https://palet-school.com/files/files/73643643079.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/75506943350.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614429e8a9535---xobizibosotunazinerinuleg.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/50383687766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+18+henPDF 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_off0000b9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BC 10112 bytes
SHA-256: 76cce30f43c76cafbe7f87ef7e69968623364e5e3ffff0a04ec9e70edeca44cc
font_01_sfnt_off0000d039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 19048 bytes
SHA-256: fe630a19b1d11930ba132c4822ed74a562160083b8b232a5fffaa22b26f66ac9