Malicious PDF — malware analysis report

Static analysis result for SHA-256 a542b1804c1c2be8…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 02:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff6de1570f72555168419c0f789a6a2a SHA-1: 39f6d5154e238017b7bae7a7891a0426a011e0cd SHA-256: a542b1804c1c2be88b872e54ff2cb505bebb024cba0db8f4087fb728f071732d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=put+on+a+pedestal+meaning PDF link annotation
    • https://krono-original.vn/Images_upload/files/juribiguwataz.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca1056bc9---pijepilabeninul.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/kifemozozarexulunute.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/42178628352.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074dbaff0d34---3289722091.pdfIn PDF document text
    • http://fitviewer.biz/files/file/damufomafifilaxafuziko.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/17452100250.pdfIn PDF document text
    • https://viettrungson.com/media//Files/rutorifugi.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ce307d76064---gakazafonedopi.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071984dd9ad4---88508771218.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/4451989341.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/5a4d22f5db6b68cedc0a316f54eab26b/53959936592.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/94766022955.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/79096675966.pdfIn PDF document text
    • http://jar-ted.pl/file/fafewuk.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/r1f4cpdhrlgmfo40n4jsrlvkso/polujixa.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c774dbfa93---ramojejuwukax.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086439d5509d---88239139813.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/zuwotet.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/43098337161.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/pilijedazafurisapelogeg.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/11936476279.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/75324526623.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/49920166687.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/roteki.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_off0000d3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 18260 bytes
SHA-256: 611ee32cdfe22bbd567d960cd5daef4dcda25b27af4061f507b3c66ce2df9b7e
font_02_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 10736 bytes
SHA-256: 888d251e6f45744e1cd2017cbf593421621a3875f5099bd585d71d2e5857e248

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