Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65c071e1d200423…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 19:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a68b9b1365490efb03a28067ddd01283 SHA-1: b280d515a7123387bf31d68fa3549ef0f31b05e8 SHA-256: c65c071e1d2004238fe485b6b1c5190fe2085df87c0e3cbe48ef02624debf273
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to compromised or disposable hosting domains, likely intended to redirect users to phishing or malware distribution sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt at SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/787ab57e592e2ed7035512ab586052b8/bawomox.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c7a944b9e---43048257767.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210604131200455.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cc455538bae3b4ba7a248e1285d10e2b/jijagawojin.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/11721227702.pdfIn PDF document text
    • http://fabtur.ru/upload/files/8310061059.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/84103885133.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/41439761687.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/dolefiz.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/33866914430.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/lufegubekesetu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b924a1b6---37427841417.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c61ea2973e4---zululudi.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/93103353647.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/mojiwi.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086daacb8ba2---bivokakepinegasokum.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/55806905985.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e15adcb8---fataxotajefexodoxen.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/22844336618.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd137877cf---33720802539.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609285a5caefc---79636625752.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161190db7f1751---kovomitexi.pdfIn PDF document text
    • http://gdgom.com/upload/file/2107030042575753153tr5sk8xhsys.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/94f6evkp48audi95n8e93li9hs/33782557512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=catia+drafting+tutorial+pdfPDF 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_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 16976 bytes
SHA-256: 625f5cd73b29ad35bb2e39ecbbe3a06e10c93b672dd737c9037ff302533021c9
font_02_sfnt_off00011d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 10504 bytes
SHA-256: 7c1d45784981b183dadc5e36db3b48654bb181829657edefc6580985eafe1184

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