Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5eae397f912a281…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 14:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfdf8550aca190ea025e90e12a50d9ad SHA-1: d770cc89385bfee02387d8fad378740b5944a9a0 SHA-256: c5eae397f912a281b9e7745792e531988fbf98cddb544b6daad1ef0df77f248f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, suggesting an attempt to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host a collection of potentially harmful links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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=how+to+change+fahrenheit+to+celsius+on+android+phone PDF link annotation
    • https://bbox.ru/images/shared/file/luxadazabibiviwijobokew.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/48174271156.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/2904790183.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/46643172922.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613346fe2d7c4---lugagomaditika.pdfIn PDF document text
    • http://masonhn.com/d/files/kizofofi.pdfIn PDF document text
    • https://funke.be/data/file/veforuguvo.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/95190096173.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/kefilafitevikax.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/kixigorezuxoxekijax.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/4512372321.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/kurovegadapemusapalel.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/58255873887.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/23729815014.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/42199552140.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210905163114.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109050649022554.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d2e8e92a0dcd5cb5e82dd1f624b9374e/71212140958.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614055d378fac---kofomuretotisalebobajib.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kozabufepadimoxifaba.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/89833407759.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/93e88df70f33e66dee57109d9421a20f/kexenasejozikorit.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613548ce1191e---59233642014.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c400c1377e---latiwufaxoxajiloxakesugi.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210907_23CAE31E8B0064EC.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/dobafasivajaz.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_off0000e132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 11076 bytes
SHA-256: 3e24b1ad4837f4c8c55b8f3601411c5bd8e5e265fec23cd3f1e8f689d96ebd7a
font_01_sfnt_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DA 18632 bytes
SHA-256: 83d9a405be5afeaba35e12305c660a5b3aa922694a693e144356098d130f65ca

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