Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc548ecd4de47676…

MALICIOUS

PDF

83.0 KB Created: 2021-07-08 10:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ba637bf9e75f1d22372bd45c9316af0e SHA-1: 2d95b8736d4bed597a5927dd3b696de61e886992 SHA-256: bc548ecd4de47676515dff36fd769de771aaa9687a9c1d09a78eeb6a5fac30b9
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs hosted on potentially compromised or disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://antonio-pelella.eu/userfiles/files/xolijuwe.pdf In PDF document text
    • http://berbun.com/user_img/file/soledova.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417dbec48c---65801406748.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/bakofiw.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/guwekawerat.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096de3e4e038---60469896247.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d3d8c583950d77ab099535ee025398f7/xuvimanaz.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/93009c16c9f0d04dd6af03a05806b350/77624064812.pdfIn PDF document text
    • http://metapolar.hu/tmp/bujomi.pdfIn PDF document text
    • https://flomogroup.com/upload/files/wawokaposaxivasik.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ab2d75ab82dc0427678b23b62630f7c8/rifig.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/7s6ah4sdvbhoehdg0iphjqpvj7/60489841778.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/93191439504.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/41997173188.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160879768beaca---7097392421.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/gqldt5h1prdpdnojh30pfo2h38/femupolexi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7377968d8e---sofimebuwozimuzusota.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/movurenivotelalad.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c76a754288---15429723631.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/lenomivejejabefaxutuzikim.pdfIn PDF document text
    • http://muszempilla.com/files/file/najezixiwijixemebisezoz.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/91580337907.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/66864372751.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31a6020e3---82019824618.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/bagevototupeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=be+a+sales+superstar+brian+tracy+pdf+free+downloadPDF 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_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 15944 bytes
SHA-256: 67e541510829891814b28715a969b6dfbf09642f1e15ca893a41f1b1a385cea2
font_02_sfnt_off00012453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 11108 bytes
SHA-256: 0a1124caacc43e79c821322b63612f98a01f53a52c3fe21b3f5617f2ddf55e63

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