Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4901178d6665b6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 15:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: e5fefebc1a069e7f43cb95d4b71c6d21 SHA-1: c9efbc2cd49ed342c446398c4993997841513685 SHA-256: fc4901178d6665b622a6c04c9a74eb5d991b86fff0af0ecfe44cdf196fac8335
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various websites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=nba+2k20+apk+obb+98.0+2 PDF link annotation
    • http://otohyundaidanang.com/uploads/image/files/77764770225.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/luxapumurakuf.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/zowinuvefov.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/karijeti.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1614049f9110a9---fudizumolefe.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/ritijekuno.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/70744819492.pdfIn PDF document text
    • https://ienter.bg/files/21274185713.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/lutorimat.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/27103219941.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/16116150073.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210901/file/95789499918.pdfIn PDF document text
    • https://buyafranchise.org/files/files/96325015208.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0ea81478b81673896b5ab2b738162f07/kekiji.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zifufumukuri.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/bikijawefuxefamo.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/deteraxaka.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/kexelowog.pdfIn PDF document text
    • https://sapporopools.com/contents/files/dogowupezekazunow.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379e04a7f7d---wekafo.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/89624271997.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/puzavalumevazo.pdfIn PDF document text
    • https://ismart99.net/upload/files/47935747636.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/fuac1mp8ar3j4r6b89jvod0mj9/45853647628.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_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 10396 bytes
SHA-256: 5a0cdcccca16e8bd3a489b1b5542779643aaa4b6fe9b8e62b14fde331c3526c8
font_02_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 17836 bytes
SHA-256: a08a6d4416ef96a02f6a73f91001e63d2b058ed3e1bf5c7d6523d4fa26b1ff11

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