Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2481acbab1a788…

MALICIOUS

PDF

89.9 KB Created: 2021-09-01 03:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45fd97b38e9c86adfffc85c0a6afd125 SHA-1: 3ebb944895514ee4e3f74307fd967bc82ee9f2e3 SHA-256: 7c2481acbab1a78881881e0c874d78f5f0609b3c43e011c2ac2cb15e650f08cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many pointing to compromised CMS uploads and forming a link farm, suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://queure.ru/uplcv?utm_term=and+he+will+raise+you+up+song PDF link annotation
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3fd077e4b---72841878968.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/40941829606.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9aaee865---6895570987.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/32623206080.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/temub.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/relof.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/48df0q2rd1uu3c72e0eg5fng5m/69919606210.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea5f0aa036e290a00fa537959712d397/bawapesusokukuxan.pdfIn PDF document text
    • http://classtool.info/upload/files/zogofax.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/9025540751.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ruvmv6tr790mjhhab5oo1c2upd/bisanalowamekezixifigog.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/fibubevogusaparixutabal.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/tesoke.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/lazosobopij.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/72573144259.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a3f826d5bbee498c9abe1bd99ba65953/28231250023.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/86883441393.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/70738358679.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/23461391928.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609453e8cf3c6---33240503499.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/840221440.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles//file/pimomarepewifofa.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/mumijipuvotarezugo.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/80099279762.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/lujuzofozasop.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/dizoferetolinaxet.pdfIn PDF document text
    • 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_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 20700 bytes
SHA-256: 0de6f345ffb1e70533df61e76c90afbf25fb4ca7b4c1b315c15a6cc51d5b19c5
font_01_sfnt_off000128e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E6 10856 bytes
SHA-256: 20ea3cf06c5a39fc3392d9fec9f6edb2d5f76a53e5e2ecb76476eda78b536bae
font_02_sfnt_off000141bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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