Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ae955dbacb8b8c…

MALICIOUS

PDF

98.0 KB Created: 2021-08-25 20:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93b7824b40608850b890f84cd0b0a710 SHA-1: 58036ab671c47bed49cd43a46a9cf308ea8be129 SHA-256: a8ae955dbacb8b8c4df3a65efbc4fe146aa948a65471236361965082a029d452
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://am-assets.com/aom/magnolia/userfiles/file/kajoxopipejeruluz.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160930879a0dc0---tasogenevenevabosafidosot.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/30777733179.pdfIn PDF document text
    • http://euroinstytut.pl/galeria/file/93192957819.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/76118535071.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f7392192b---28314948443.pdfIn PDF document text
    • http://darec.sk/files/files/49949918677.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68805effa---22222716713.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609779ba96aff---lixas.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab61dcb406---52127407280.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/desep.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/papenoxegurekunipuso.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/71744197982.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5ad966dda706ba59a821715ae6c95b52/ribad.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210614/file/16236726519746.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/wimobofaxalom.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089543750ff8---1818428966.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1832620c17---sebemotukodefotifi.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/95df6d81a28b38229fb0ada2c53ec397/92891336994.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/lopoga.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991ee295efb---17472730621.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/pemifubanedokiweru.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c256349f91e---51692868717.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ts9ihluiup4fqt3p35ucmk32lu/pekarukag.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/daxajodubajizoxoboze.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/60953649940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=an+introduction+to+critical+criminologyPDF 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_off00011d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 16840 bytes
SHA-256: 253f3b9ea0d6710b59d57e3d949011a0a5726abd49a6f6c4c74f4516a54078be
font_01_sfnt_off000148d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E8 10608 bytes
SHA-256: eb12effc32c4ebd522dd49464edcc3d2e4215e094aae66cf20ab27498aa95514

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