Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ef5cbafb06faee…

MALICIOUS

PDF

74.5 KB Created: 2021-07-02 01:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a148c69119c50fee1d9dfed62fb68d99 SHA-1: 4f70e542d75c95b2cc749112ce3341d8d5356d5d SHA-256: 24ef5cbafb06faeec410bfcda083705d6dd41b34d6da92dfbcaf84fd830f0555
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of external URIs and the compromised CMS upload links indicate a likely attempt to lure users into downloading further malware or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://catamma.ru/uplcv?utm_term=stephen+curry+105+threes
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fea0dc02c---27020322275.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d05b203647---67170086326.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160893e12158df---moreturajizewelopoka.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/29db58e040562f9657c2c9aa84d800d6/fetarusikixekow.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca6316b387---fegizirikatuxawujofobuta.pdf
    • http://atut-biuro.com/uploaded/file/88164304843.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8177b2c0e---64079903635.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/s9nr2atjgkq9p3l7pkpri6c587/74349540301.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6c3aaba85---37241654469.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e7c6df73---wotafixufam.pdf
    • https://agermag.ro/mm/file/sevakemoki.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/aml326uqg7r89rrmno0psjv817/45181057615.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd276e47becd31423d33a7f1d37fc705/52183499162.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afd05d8c4ff---wubopamotajebuvaxetos.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b5149eac12368eb037d184dce8259187/jegiga.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0950bbf558---toroj.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f405c39ce---25261113404.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1826a7a0---depapaba.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/d0ebd640qh8asfnhrhktr8h0bd/povukuposutaxe.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2a2d95672---77216717190.pdf
    • https://soechi.id/userfiles/file/24659971740.pdf
    • http://eaas-journal.org/survey/userfiles/files/fodudikirejepizamu.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4a62267d9e85245adc91dd074dc5d4aa/36897118480.pdf
    • http://palenice.net/obrazky_clanky/file/77262201643.pdf
    • http://yilip.net/userData/board/file/paputinidatedada.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/rijikelemus.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c19a.bin
87d24ebb02b9654e5091798978fac25b7fa6db9143dae0068fc8092dacef11e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC19A 16288 bytes
font_01_sfnt_off0000ebef.bin
4464d6dbd3888d29dac15cf507f3263c5970297ae38175ddc35684e14a64a317		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 10648 bytes
font_02_sfnt_off00010462.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 16792 bytes

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