Malicious PDF — malware analysis report

Static analysis result for SHA-256 d784ee5ef7a04434…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 16:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3fbd78dc2710b9b8406eb9988dae2a1 SHA-1: d5287a7b7c611f354533c1d270166b5dc802ea55 SHA-256: d784ee5ef7a044346670fa3769bd7eaf7843473239cff52b82aa70b58052be1c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/c00a7770cf6b6645510545536b0523fe/tomiwexazozizamanafomote.pdf In PDF document text
    • http://tieulongcopro.com/luutru/files/2156010512.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210910_E26A3E67EF600272.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132da54ad4ea---lumefezuzokenasusudimomes.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/jinukixugunobifamo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161361190e35b5---30891976240.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/25803736182.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///vumojukepe.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/422217934a89d6910d6928c44489def1/13425370178.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/54731976250.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/24842816133.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/supudotarasamowemaw.pdfIn PDF document text
    • https://techlan.pl/files/file/16096833529.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/78135905763.pdfIn PDF document text
    • https://eslms.com/userfiles/file/pifapomesigavuvigiwo.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210912110658.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109081229056221.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/34985279115.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/51870360018.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/43095452763.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/kidigubesanelurof.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72145331247.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202108311731002944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bhagavath+geetha+tamil+book+pdf+downloadPDF 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_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 11116 bytes
SHA-256: 855d3f360e7c072e4d70ef40819d1c1984ad848e1a3778d7002084408f32db96
font_02_sfnt_off000106f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 18008 bytes
SHA-256: 2c80f89db592ef304a54c741e5b07bbf57ae102082d2339b1183432d7a96c848