Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d485745f2d91ba5…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 06:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 73d2f2c837496be94063ff138b108615 SHA-1: c53939d303f3773143e2c3a840a81d4d5c701e5f SHA-256: 7d485745f2d91ba50dcbf798ca8ae6c810e5875db3b9c440dac341903bc3610d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to various PDF files hosted on compromised websites, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple external URIs and a link farm heuristic strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiovizia.com/webroot/img/content/files/gajejuneporusobazuzu.pdf In PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c428352bd13---29264955716.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/gabupururowuguwipo.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/nobiroxurigofa.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/23108665125.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/65044318872.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cd04a4d5f85d33e22b7c9ba6ba65da5e/15547758911.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/49823369938.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/19028383719.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/tazudofotepimunekixusuzab.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/juruganutamemefun.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/jelotixovozenuluf.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/6156887204.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/acf94a801b81f8be832788b5973d0c82/xovati.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/mukivozetilibujaxamun.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ddbbbefe5550720d0ae845fb7091b895/gudife.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768455bd41f---lafubafebesaruf.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210611091142_rzosv4.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/vurixogig.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a91eea61---24131131793.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d410917a93c---laferonifugaji.pdfIn PDF document text
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/zurusuginaduwuwijovo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d611a295---dujajusiwumoja.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fcbeb9293---kubabavovapepej.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/86129651799.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885a0de81aa---48604758340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=free+download+baaghi+3+full+moviePDF 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_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 16988 bytes
SHA-256: 67870c5f86c152146f382ba865906703816c50006209b21754dac678b3b4d68b
font_02_sfnt_off0001406e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406E 11076 bytes
SHA-256: 5261bbeafab571221d1623188b61559e68ee6e10d632126d322817e84ef4971f

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