Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d5cb49b22fe8e5…

MALICIOUS

PDF

69.0 KB Created: 2021-08-29 05:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cdafed671996bce913290d72782724b SHA-1: 785fc78dbcde8b97facb39ef16d583c0e260da7e SHA-256: e9d5cb49b22fe8e57e0c895b35f38c2a56f146c7b2eaa8466674934fa4bf6c7e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sciattella.net/images/file/50850590879.pdf
    • http://mbcasc.net/imgs/file/23505096696.pdf
    • http://studiomarcheluzzo.it/userfiles/files/xejakok.pdf
    • http://elcampoeco.org/FCKeditor/file/34736577343.pdf
    • https://jjcfurnituremaker.com/userfiles/files/dorasugamanus.pdf
    • http://msslink.ru/userfiles/files/xezikaxuwot.pdf
    • http://staractivecollection.com/resimler/site/files/32324954279.pdf
    • http://0851gay.org/userfiles/202107file/2021070321382470554.pdf
    • http://nowator-zpu.pl/userfiles/file/goxizupasexof.pdf
    • http://jacksonreunion.org/clients/71346/File/86905292376.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/75250631614.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20f587bcf3---68411227989.pdf
    • http://bomtvplus.com/data/board/file/20210529194958.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766a0ab1746---47006113210.pdf
    • https://bustotoronto.com/userfiles/file/xoladefuwibewakud.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae3b58c5bf---94631421223.pdf
    • https://foodvellythailand.com/upload/files/melanasufotesut.pdf
    • https://onlineadda.net/ckfinder/userfiles/files/videk.pdf
    • https://ruedi-leuthold.com/userfiles/files/duvasojim.pdf
    • https://gymlesgeants.com/upload/editor/file/rabelawupuf.pdf
    • http://gourmethousemacau.com/UploadFilesfile///86425285911.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5e52360fd---roxupipe.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96f6daeb6---nujajuxofabusosusamelul.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/o2dabslhdj75abtmninddf6t8s/bodinedowavelego.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=township+hack+without+ban
    • 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_off0000b27b.bin
4157959dfd9b4fd30e93276a90f97cf2e76036df89ac8af03d7843f2c17f24af
pdf-font-stream PDF embedded font (sfnt) at offset 0xB27B 10576 bytes
font_01_sfnt_off0000ca7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7D 16792 bytes
font_02_sfnt_off0000e28f.bin
64bbfc5b3c16623f463b3f3ea2493fcb18c7fdfebe3b14ae4480a0e239560681
pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 14628 bytes