Malicious PDF — malware analysis report

Static analysis result for SHA-256 c240dc6c6e4a002f…

MALICIOUS

PDF

96.2 KB Created: 2021-08-07 01:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90a94cb93f348199ab941f72b99ac1a3 SHA-1: 881add5c35269d99bba9502bc7164ed548e04351 SHA-256: c240dc6c6e4a002fde39792764d340d65c255cafb72462147eefd60b945fbd5c
204 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_SECURITY_BYPASS' indicates the document explicitly instructs the user to disable antivirus software, a strong indicator of malicious intent. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious behavior, likely involving the exploitation of PDF vulnerabilities to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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 http://steelbo.com/uploads/admins/u0/files/20210531045742.pdf In PDF document text
    • https://planet-for-events.de/userfiles/file/18226422065.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/fivowisofuberazepe.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f2008e8b532fccbc867c31f45d0e25b4/79318755489.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/lntaj3ciopiui0ui2a47cu3a80/13658634868.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f29657e0a---vajebexiligekiziw.pdfIn PDF document text
    • https://faceless.me/userfiles/files/5888486909.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/jamakumumexulemuji.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4rb5hfjn25sdv9k2rthd3bn5dk/josatiwutizozi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/51108569538.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/kimurajukawano.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/xomepeduton.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/44170991935.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/10317477518.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/fenunodupikexojadinusanuj.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/qu55sh81qnhl9ne09lo6b8to09/rezife.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/kolusejafizat.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd243ac0ea---27437235258.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/36624936290.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0b9c4e446---59407797804.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/dulabusi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/5b4ef1b403fd16a498a9727b863b1044/zimezigasurij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+download+zuma+revenge+full+version+for+freePDF 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_off0001100b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100B 18456 bytes
SHA-256: 70d307865e303b459118881b53750aff080da14c45bd3eb316e586413018d62a
font_01_sfnt_off000140d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158EF 11000 bytes
SHA-256: d413a1461a043deb02701d8ff763796fac6c0a5681db36988f93cd03e7785ea6

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