Malicious PDF — malware analysis report

Static analysis result for SHA-256 82543f7e4861702f…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 03:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0795e16665ade6ae2e54a4b8b4e32eff SHA-1: 155d253945abb48e47eb3bee6a27f1afdc226dbf SHA-256: 82543f7e4861702f104e773c3af9abd6328905d4f959502b021f45eaf37e04e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://hcpcsz.com/upfolder/e/files/20210925101127.pdf In PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e82d4940f6d563acf565cae7e2b868be/gojupufelawuxodijitonokex.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/16252261737.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/zajunepe.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf8a7b32d7---8479991174.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613971681a785---59863057480.pdfIn PDF document text
    • http://totoumi.jp/upload/file/dojevil.pdfIn PDF document text
    • http://4darchitecture.org/img/all/gasavo.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/901e46b3708f122bcd1bbe79be1a06ed/12894317388.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/lazasisoxini.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/11159345339.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/rumarik.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/48281811078.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/zazarabebi.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///51224269635.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130750828d9a---fobawinijuf.pdfIn PDF document text
    • https://bagstyle.uz/images/file/zotitiwetuv.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/60709092140.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/13200497566.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7986144116793954affc452a4e69c0d5/68671995596.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/fumirafere.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148bb58b3574---84872736497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=emoji+prediction+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_off0000aeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAE 10572 bytes
SHA-256: 727d9c55076567617b4b7d57d3ed9f638cd4cf99181f25a736340b571137c953
font_01_sfnt_off0000c6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 16548 bytes
SHA-256: 2b5967b5d0be2aaefcbe6b5a5cfb3e5969559616491bde4c16e95a9df9818e2a

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