Malicious PDF — malware analysis report

Static analysis result for SHA-256 9504ef5a0dddce8f…

MALICIOUS

PDF

85.9 KB Created: 2021-08-20 20:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29d01af32143d4c3e9c52c5bbdc1a05b SHA-1: fb027a61aa3d4de94b2c59e7678bfa329a6ef86c SHA-256: 9504ef5a0dddce8f576c94b9b219d01afd0277ed4ef50db1ef3dcd402a464d14
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=super+smash+bros+unblocked+games+66+at+school PDF link annotation
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d346ba09cf---mevedonavefale.pdfIn PDF document text
    • https://datajournonepal.org/files/xivivoxekumanativuwu.pdfIn PDF document text
    • https://brakos.it/file/91821741215.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/dogafebogudavax.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/83405744480.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56d1230116---vokobolifuzifoge.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4887b29c83646184a3318bbf911128d5/pokutewezonesaxode.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/28244689263.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/4601984480.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/gobalowovudejuf.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d62f78735---89115308578.pdfIn PDF document text
    • http://idroter.org/userfiles/files/kebuzazara.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d985d80f66---vezobunedudi.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/16202196511.pdfIn PDF document text
    • http://deltools.com/userfiles/file/54816193534.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/vitizukarexavu.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/44291403892.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90184206bf---rowusuzunil.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/suluwipatusaw.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210819_C4EB89FFD12FB8E4.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/91944483948.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161182d4ef3b7b---tidikixesu.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kasejutuzavawovago.pdfIn PDF document text
    • 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_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 11444 bytes
SHA-256: f95a4431dbf9cc3fd44ccad6edefd3eee338ad274980bada9c45d6d91b69e931
font_02_sfnt_off000119f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F5 17820 bytes
SHA-256: 1a31c0737d09c4b2aca693534bc36c95747f25a7293d54fbe1f4cdc6fc295480

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