Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0f2e159aaa9eb6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 17:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bb93f6d0edb4cb47f73dc8d721b3586 SHA-1: 9cdcda2fc426da26136dacf7d8c983d91bf7b023 SHA-256: ae0f2e159aaa9eb6742f73ad29deed47333bf2cf897e06574dfeb99a1fd2a21d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and link farms on disposable hosting. ClamAV and an ML classifier also flagged this file as malicious, specifically as a phishing trojan. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://emilline.dk/ckfinder/userfiles/files/32863313555.pdf In PDF document text
    • http://eva.am/files/05b87bc353b9b81d.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/10804613777.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/kuvezilituvifipe.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/84415974740.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/remusatavuximuduw.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/ralolefo.pdfIn PDF document text
    • http://fertilizerproductionprocess.com/d/files/lolibiperawanig.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/97168396410.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/61ed209eab4bbd5e64f641e71f684218/zoripijidexet.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210907_73C98ECF6B40ACC8.pdfIn PDF document text
    • https://actorconseil.com/files/file/vojedilinolaruwaba.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109051919342397.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/41553823003.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/gaxezixisemezid.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/bufemolizid.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/gidewox.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/5440399167.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/bodakogadufumemonividovum.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/55c77986ef01cf970a8db17f78c13622/25949890046.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/12524790726.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f377a04bdb---nikegoro.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366ab676d91---41074028867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=minions+rush+apk+modPDF 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_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 17468 bytes
SHA-256: d0f781a2b3a387e1b28fbf45abc32d5c1ba77fd4a9817d0e005062fef5f65f18
font_01_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 10564 bytes
SHA-256: a995945d9cd83d629384ba62373f2e24d6eabd0d9190e4725bd53d16f677eff7
font_02_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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