Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa48b65870b70792…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 13:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f91a59284a7ba64a34bee225d4176e42 SHA-1: ad294753c275461a7ccbac96629f000d3c3b0534 SHA-256: aa48b65870b7079272741a41364174da72fa75c2371ada94069fe95c703d93b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ud3i163mn46dk0i4ithn7s0p55/64905163252.pdf In PDF document text
    • http://esipro.fr/userfiles/file/zixibaxexijebofipafa.pdfIn PDF document text
    • http://apcmagon.com/userfiles/fosunibefomesuroralaf.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/foponezotepegopebok.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/piwet.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/25720129782.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/13435134646.pdfIn PDF document text
    • https://medtek.vn/storage/file/94784497716.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/xiruwiri.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/87971758444.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/87781603486.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b5f3a9b97d17543f3166eed023ab51df/xuxeletanefotisidino.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/nadipinisazajutawesu.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/jevinalabexi.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/fomaguxivos.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5ac4034474b43e64ca6e3898466dcd95/88173824382.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/giwojonogekasir.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afd24b70175---84867555391.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1d5f2913---faxatirawedarosisozoveb.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083f99c29362---matekenedutoji.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ndt62724t6ja16fhadea2asror/41767959114.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7b4341ee55c225b4733ba507818d14f2/belotasukebasafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=schumacher+jump+starter+sj1329+manualPDF 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_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 17376 bytes
SHA-256: 9c51ae9a8ba7a80bce20d912fdbf9e161c32534b1ecf54df5e46000cca1b29ef
font_02_sfnt_off0001245f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245F 11244 bytes
SHA-256: bea22f47a554848c1f3d604c470e70be67066e1ec28872815774dbbf636a252d

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