Malicious PDF — malware analysis report

Static analysis result for SHA-256 a018a141883cd8ae…

MALICIOUS

PDF

90.2 KB Created: 2021-08-01 09:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c6f11b165030e2243ec114c09d3eb2b SHA-1: 888a0b3f2aca963371549d1f3d94cbefcff14d75 SHA-256: a018a141883cd8ae54d8d9b94fff4bda1e874760c799a6a7e64fc8b139946b18
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised CMS upload directories or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/58121650872.pdf In PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/vigadasosibutalen.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa279292474---24513284142.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee1352212---bebokaw.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f3bbbb775---73239596151.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/6233960992.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee59cf952ef---69451747570.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a1a175cb4ca430616a74343b5f134da/92024880179.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b08edb131a0---922602259.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/39929844399.pdfIn PDF document text
    • http://jngf.cn/files/file/fazefu.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/48ddb1mqoucsat1lmshbbl0onv/95573107436.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/bibujifo.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/latuxidiba.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/40728433570.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/nobewapalirepizevivaxixek.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/48d225a40e32abebaeb75d365fa44f83/gedugonazolatuselodin.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/1c308611c14027b913988241eb76d0c6/bezotokurowigoguze.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bae5e3429---81591913621.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/fadopewud.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/35296514941.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/v087riroohru0p3rjj7ma4c6o6/62423085050.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/lakuritomavixuvenada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=apple+watch+ekg+accuracyPDF 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_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 10544 bytes
SHA-256: aad507fe2f51db73fcc387dae6b5b2b441dde934b4ff1da66d500dab683d2de4
font_02_sfnt_off00012f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3A 16956 bytes
SHA-256: e7d7e55b66438d17eef03850c05b5a9d06cbdb86fea798366f16c90698c8de95

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