Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ad6033bbeb426d…

MALICIOUS

PDF

76.5 KB Created: 2021-09-04 04:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a18e6abd74051b585539491b78448e1d SHA-1: fcff2e62724f2b3c8e3277f039ffee2218fd0443 SHA-256: 10ad6033bbeb426d7ffccbb1471809475c15b268790b1b22823e2b57a392549f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to manipulate search engine rankings or distribute further malware. No scripts were extracted, and the document body was unreadable, but the URL patterns are sufficient to infer a link-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/m0ds1gkovhu1hknscioj1ern64/30706960611.pdf In PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/8a2q2eqami702db1j0kdd8uvo2/zutoperovafigonefubilamer.pdfIn PDF document text
    • https://cape-electronics.com/media/file/22373734940.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050506323934.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/45628118835.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210701022243008223zkkp0.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/tonexafofudekug.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062122031744.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/sikeweselilifajobav.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/jbqdppj41h7cgfhuoi9t8s3ri6/xazij.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/85e3074ad40aca84cbf399fcff4bdc2e/zulilabeworumurifar.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961c93e64e5---nukenawudofezaxug.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/kikuj.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/kexitinutore.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/lewovaf.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/wotaperudenov.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/tojagajaxaselu.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/wowijanatobipewub.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/e7e323498bd17a6bfdf1d946d9136f91/xosas.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/71080350426.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1fa84e59c4d8139ea6642488099d9246/depenaxobilonajikazalekeb.pdfIn PDF document text
    • http://kasargod.net/uploads/file/92608395869.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/wepupuvekawabevola.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a38083cbebc---zokuzafimederekakijuriw.pdfIn PDF document text
    • http://heizler.hu/files/file/17856076670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+story+of+my+life+helen+keller+book+pdfPDF 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_off0000c580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC580 17668 bytes
SHA-256: 0a10908c895e34ce9946d55a05437dd68496b1f6a8d358be9ca8c31f4d66768e
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 10908 bytes
SHA-256: dfaed7e5515b25c7e8fa8d1b953e4bc1c911c6df5ed04e7d7e12825b23c734de
font_02_sfnt_off00010c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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