Malicious PDF — malware analysis report

Static analysis result for SHA-256 007855fe8459e5fb…

MALICIOUS

PDF

77.7 KB Created: 2021-10-09 03:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 915babed2d7d1d3f4e1780adb398a427 SHA-1: ed48fca93b6dbaae7d95eec30fd9947987a28c6a SHA-256: 007855fe8459e5fb5fcaa31adb08f1ffbd340c6a4e686bb2118e7d022a6e9ab7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to 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://crewmak.ru/uplcv?utm_term=foreign+commonwealth+office PDF link annotation
    • http://parcroyale.hk/userfiles/61092380218.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f54cf32a9c---fagefateboberibekezuto.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/23927458459.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/mukoxenutorikomovebonozos.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/48150870481.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/gasefafa.pdfIn PDF document text
    • http://kes.org/upload/editor/files/belutafazajofiselagit.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/jodepiniruluguli.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/kufenogudixozebefuzividij.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/27656822222.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/8b292c999a8400fdb96eabc85a70dc2f/xuwexozegezufopepokatod.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210916015446.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/68831898472.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/58762921460.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/92856827775.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/kajafijefogotozuvifi.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20211005_4962D6354C7D80D6.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20211004002144.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/jagelofefagonalup.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/77416959161.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/182123438363.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7f6da0288---70242718865.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16155bd07c2c34---senoj.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_off0000c6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 19532 bytes
SHA-256: 4ddc93047b19419de425235d3f2c54f541c1bb15ab38c28368dee6656d9a46ac
font_02_sfnt_off00011117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 10676 bytes
SHA-256: 2ce07f01f08ae0b8740ea3505cb25607d5324414fb1e97e2aa89715930af86ee