Malicious PDF — malware analysis report

Static analysis result for SHA-256 902d73780d2a1f83…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 05:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71348c1463a08d661a68cd2285a6f336 SHA-1: b8a0c5ece83bb50f5277c2435f03beec4658733b SHA-256: 902d73780d2a1f838925f030f3141b20326ce65b0d6dcdf2a1f924a159babd89
156 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 high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+download+play+store+on+windows+7 PDF link annotation
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/44805509985.pdfIn PDF document text
    • http://cartopack.com/Images/file/nudunimebanuvopiful.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/65681597498.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/13999729758.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/xidizoferebofone.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/xewifiguditizulenaritod.pdfIn PDF document text
    • http://4yoga.by/pics/files/zamabudilonuvow.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/2364033132.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/tadeserejenawixagaxanovim.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109021518097807.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/sovokamomuloguremoxuwiw.pdfIn PDF document text
    • http://favourtec.com/attachment/file/36488314111.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/34352491623.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/59607750878.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e14cc6ecebff60e4be1d244e60b3cdde/gijurinolibojut.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/xujumanabazakarudamewuj.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403a95d909c---zezivoniwiwumunaxobed.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d9d182547a075047e3f0079378f23afd/duwowuvewinijuki.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/jobep.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///retogeko.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/67943056463.pdfIn PDF document text
    • http://ing-ka.com/user_img/file/fewugozitemufomelefovap.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/c0e4ffr8kvs7d5adf0vrbjsp63/63386272285.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/bofarupejegis.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_off0000d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 17068 bytes
SHA-256: 9a1a0ddea7517557906ad318ee5be8ba5dce7c45e3e1021871498bc63d496ad2
font_01_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 10624 bytes
SHA-256: 221bcf1e81e6a5c90f9f5357f59ebd7bcf544b6a461ee4672a90abaf9ef4c29a
font_02_sfnt_off00011b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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