Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1e80c87166658d…

MALICIOUS

PDF

89.3 KB Created: 2021-09-09 04:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f2c5f100070f8604a8908b40c90852e SHA-1: c7a2c67797ebe0fb16d8860c8f7f5f0016480487 SHA-256: ac1e80c87166658d9e10b7d69a490fa98c2c3945ffdb4e1c4b3237a07e083875
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains multiple links to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The PDF structure itself appears to be a link farm, leveraging compromised CMS uploads for hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16138870d2d27b---13514862580.pdf In PDF document text
    • https://insinkerator.us/images/uploaded/file/28229790577.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161301d1adccb8---99435179483.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f0c143e6ac1bc1ae727a82ef5b3892ce/sixosoriso.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370f14796f2---taxevojurezixisozukakejo.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/lobigelo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/0f0451d5cb58592290f8e6cdbee9b87c/7491567608.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/vidilobakedagafovasabilud.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/fosukudo.pdfIn PDF document text
    • https://matratva.in/userfiles/file/vozawe.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613054c201969---pubirogisiwuzopuvepim.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/16771c5cc362d2a571a7ea68730a817d/lamoga.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202199133427256.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/21173018771.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/jenuteduzuganupe.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/ketumujojejofufofuxodelas.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/nivutibafu.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/fabojididujoramutatale.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/75382854822.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613498993f671---7242721250.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/28345970869.pdfIn PDF document text
    • http://namngonviet.com/user-/files/zajogifow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+best+free+iptv+for+firestickPDF 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_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 10528 bytes
SHA-256: 6136ccd4f100927b102ac287493475e2607a9ffb482b8a93721a82188e1f232e
font_01_sfnt_off000110b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B0 18248 bytes
SHA-256: f09b500e0a20f2fd75cd385351dab868bdc8fb31f1ebe7a9bab772d396c5b495
font_02_sfnt_off00013fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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