Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a89eb77ce3d91d9…

MALICIOUS

PDF

84.0 KB Created: 2021-08-03 16:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87e36501f5c3f073aacc8dd7a0fd4a74 SHA-1: bae1f6d646644946be96edfa06c4e31f6cdd1064 SHA-256: 3a89eb77ce3d91d9da0963e62a1dee8dd3ab4f4c7bf5544321e94a96a11c0c5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=descargar+musica+de+antonio+aguilar+con+tambora+gratis PDF link annotation
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073089152494---xisidagasepiti.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/jesomaridisererejasepo.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9b90021824affcfcf3a63a69ac1f63c9/kuten.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608edd0579602---29976164495.pdfIn PDF document text
    • https://capecoralliving.com/media/file/fufipedewos.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/bemipigivobedofapama.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/46234105690.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/82095410227.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/79944340721.pdfIn PDF document text
    • http://flemisterbauldingfamily.com/clients/8/82/82a21d9598fc66f9117a8fb7222c8fd0/File/5172794039.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/sikevipodakizirudonodozo.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/soxomu.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/nunipu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9e6420d66842455a32937e192828fa8c/vefogave.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/xafavewanufafiwejib.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608764d3abeb7---36415114334.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/pisak.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d626a4f9f2044235a1af88f0f1f0411/selepusivaluragog.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4c72332e80f186ebb8dc69867954de15/wekuzapiwuvulebutazifitel.pdfIn PDF document text
    • http://elitvorota.ru/f/file/selepatu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c3327fc8795---48155047863.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/19639620628.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/be37ed94edd00b76ae364c3eac624834/48065261764.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mepunitogubawiz.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_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 10956 bytes
SHA-256: 60b0a929870b0583cb46694f338ddc551348c404fc32669c1f0b0050a82e1ca4
font_02_sfnt_off0001125b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 17800 bytes
SHA-256: 76f063aa5b9514291ccdb746991e5484620721a35effd90ee2c19a1bf3391d4d

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