Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde8d559b5dab384…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 12:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f12b66791c1165c6b90d22900763925b SHA-1: b996721ee605ab53d17b9fbea324bc8a0ddd5e5d SHA-256: cde8d559b5dab3845ca6f2070f6556d8ddfd3224122ef918c397c1f4c8ac0fc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which are associated with compromised CMS uploads. This pattern suggests an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://majedalkarkhi.com/pics/file/99095494078.pdf
    • http://fullx.net/files/gokopakiwufanexolam.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/tetirotijumam.pdf
    • https://panoramabyty.cz/content/8110549887.pdf
    • http://bsinteriordesigner.com/userfiles/files/nogetusifogupoti.pdf
    • http://sadrokartonyhk.cz/images/fckfiles/file/kusozelari.pdf
    • https://iaido-iaijutsu.ru/userfiles_exc/54432274847.pdf
    • https://galerie-louise.be/userfiles/files/guzumupasano.pdf
    • https://kstraders.com/userfiles/file/tatitimipoluwijepita.pdf
    • http://capitaldanceacademy.com/userfiles/files/55919472843.pdf
    • https://commonlawhouse.in/userfiles/file/91194762369.pdf
    • https://thefencedocumentary.ca/adminfiles/file/38688203727.pdf
    • https://jagamimpi.net/contents/files/22965045121.pdf
    • http://liveranigioielli.it/userfiles/files/69601018691.pdf
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/nezofanafefowomod.pdf
    • http://jolanyee.com/upload/files/202109182237497406.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142172fc8356---madapuzudepojepuwifezilo.pdf
    • https://mobspace.xyz/web/img/podborky/files/88419770506.pdf
    • https://emilline.dk/ckfinder/userfiles/files/72995289052.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426f235a970---28707521507.pdf
    • http://timavoshipsupply.it/userfiles/file/60961615266.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614886301494e---rawatugoxexelavopetirijux.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca48c82ae---jetajaraxulowodaka.pdf
    • https://soudurelausiere.com/upload/editor/file/62524536751.pdf
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/71411715171.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nba+cracked+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 16792 bytes
font_01_sfnt_off0000f27b.bin
cca14e018474ac69ae3444639b45c030212f181965a7cd03660001b45cd1128a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 10088 bytes
font_02_sfnt_off000108d9.bin
e9bf84e54f41d1a423d91add8f90414b65bf371efe6d00983c53bf9b3b3138c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 17972 bytes