Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5b72383396a023…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 00:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18c43b0c18f207b984bbbb469df5ddad SHA-1: 22896109c7467f87524da4693d3e673babf6b044 SHA-256: 7a5b72383396a02353e397590b4259bbdfca255875b9a9bb5987f656747af3b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute malicious content. While no scripts were explicitly extracted, the nature of the links and the detection suggest a phishing or malware distribution vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16136820fbb951---nixidujevedozaxajil.pdf In PDF document text
    • http://abwbaltimore.com/uploads/files/90569780795.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146548a44477---wijaketofa.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/rurososebodutapitubemi.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/12848945568.pdfIn PDF document text
    • https://slide-bearing.com/d/files/64885423508.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/lupol.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/fosemoze.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/45208201204.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145ac191a032---7205570355.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6ngrjaau5mf1q8sq4obg1oovkt/vuriwukewabelefebubumole.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210903132203.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/48875014008.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/74722565884.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/dagarijenuwesiki.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/jodokipifejuwufaronaka.pdfIn PDF document text
    • https://eklyps.net/images/file/jitamif.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109111019415427.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132649fc508e---finominuvaratutefose.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/3494707297.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/42028770085.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/87k81fguhnvv36f6big3m4hf7k/92693460143.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/pajukara.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/48784283854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+lock+landscape+mode+in+androidPDF 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_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 10844 bytes
SHA-256: ac77efd6be71c9370247399c2716d4988388bbe539dee62aeb7fd5786c17af04
font_02_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 17688 bytes
SHA-256: e23ca1af2f041167167c13c96b662749cbffa986f76448f5ab892b5340774f78

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