Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dcecb99f31dd28…

MALICIOUS

PDF

91.4 KB Created: 2021-07-06 22:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24f464ba8fa03b0294c756e58619c501 SHA-1: 8729b879176ecc36ff76dfd15ec7f89815479711 SHA-256: 52dcecb99f31dd28cebe44b9e77b6ab55578e498efc7b5fd3aca91d57c10556f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple disposable domains, many of which are associated with compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://bdsvieclam.com/upload/files/25615227266.pdf In PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffbf791acb---12329383347.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e4bfdd2fdfefe7e8afb0d172f455862a/telupimefevili.pdfIn PDF document text
    • https://activepymes.com/pub/file/muginakokuzedezufixobow.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b9d097090---89753343667.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8ea23a0eccb4ca4f894b20db28ce2265/tabetivesojiw.pdfIn PDF document text
    • https://yorapp.it/file/13047188074.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/480a46d7db26981ab952484e777d03e9/rozeruguxoti.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/9468498224.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/xuluruw.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/71402476690.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1v41hggp89dpp0viqcfql74ck2/zapud.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jusoxuvuzuvosudisib.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/93lpd6rcttr9lmpse1oce6phnn/52231655836.pdfIn PDF document text
    • https://bnovum.hu/downloads/limifumatonufuledolu.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/466388203423ea200cfe245ff5b75181/75263974116.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a011419e24---60336137444.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/75431063535.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/11cfda2fae9d6b87592b0538d818daf5/66095944840.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/63347641898.pdfIn PDF document text
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/vonafizutotutaruvu.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/lhmdnf1an5n1f4mbo7kekj8037/waselizekalufixikor.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xuzofazetiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=events+idle+heroesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 10232 bytes
SHA-256: b94b48df5a7988516aaecef8599405dfd7fa037eb3de2c1e377e1643fb063ba5
font_02_sfnt_off0001176e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176E 18344 bytes
SHA-256: e44f15a3df69845ac89fd201953e0d26ff3cef99c9ef9baa88bd0cca536ba936
font_03_sfnt_off00014817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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