Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c5c451817f9996…

MALICIOUS

PDF

95.9 KB Created: 2021-09-07 07:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b4ed6a28c5d2ebad5eab3130b59730ce SHA-1: 5e76f4efd933c2a4bbe8a0080a56d50b56f8eaf2 SHA-256: 99c5c451817f9996b147a393e9db188c3c57dcada7d6b324a843804e1665bc02
196 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm for SEO poisoning or phishing. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for social engineering attacks. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware delivery attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://chambres-lannion.fr/userfiles/file/dexefavedusarilep.pdf In PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/93861942427.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2cdeca44d---47910072115.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/64d04ca14d0b6441f2cc040d7ebe3db9/pubapogoru.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t88dvb19s365g40s6v6jdvremm/59942399157.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kirr5co30lgn90064bubtruff5/wunugiberavewafigelevutaf.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160837a73c999c---80785987581.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e71c75b8f---parisubirojogozixo.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e82baea19b1---5756800862.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/nuzedimoxopomofefe.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7615e94e71---3919586939.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf356994f---likusudosupisogujozu.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/rebeturokuvukutekaduv.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608e16b398cea---28257462001.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/kigaledaga.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/gifuwukobaz.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/26293857295.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/rikisokusenazok.pdfIn PDF document text
    • http://veno2.com/upload/jogididapebuwibebamaxapo.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/patabezetafugu.pdfIn PDF document text
    • http://wohntraumgmbh.at/gufoguvotonomozazowizix.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/42463667260.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210907051312_eze5gp.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608488ffdcc4f---popefotadobesagimefevi.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210804135503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ford+escape+2010+sync+manualPDF 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_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 10968 bytes
SHA-256: 455ad3b07b7c389364e4ad696ebb391dab9717b0720c80d7897abdae9ed458da
font_01_sfnt_off0001291a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001412c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412C 18792 bytes
SHA-256: 101fd8ac854e67c2d6b888587cd9a410f0fdc92f91ec69afc94d622c7abca2d8

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