Malicious PDF — malware analysis report

Static analysis result for SHA-256 e370470f59b09c6d…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 09:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8d098e8fd2ec4c32238fc5ef547659ca SHA-1: 36c1dc6e315d8daa62b54c8c47b4747c9a32124e SHA-256: e370470f59b09c6db8c82dab70408be99968c087592fb2194c6053e158023d31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The document body is heavily obfuscated, but the presence of JavaScript and the link farm suggest an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ketchas.ru/uplcv?utm_term=woman+from+willendorf+austria PDF link annotation
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16094364dba821---29091755000.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/51871724291.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83be30bb5b---22828043376.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/69287188322.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/bh9k80gsnqb4abqioebo66k2jf/figikadumixoxonil.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078179cdc4d5---61514427658.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/q2md866eoudltrttbbvsmff6vg/58298246216.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb8aece2d2---97413590587.pdfIn PDF document text
    • https://tonitomov.com/picture/file/4783714611.pdfIn PDF document text
    • https://coluer.ir/documents/file/25229795835.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/864819b10b91d09a5db1e718535b788d/xafixulazupumexavokan.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/tifalebixefimalusuput.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c6a4aad7---rubiwaxugudutewogodagegiv.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/f145927e0cdd1a50d77787ef9fb90512/42414888521.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/kuzarajunamepudubafago.pdfIn PDF document text
    • https://endobible.com/userfiles/file/xepojomemixigowelorer.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/2058527282.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/49d8f033d7a815a55eb3927f474ebc66/18446586805.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b04c48b57dc60c2cd72a265bab4c171f/67342058870.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611da1a54acfb---13726807982.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c589a70dd7c---57644450754.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608e4e0933a83---pojovipujejuzipiludakoga.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/jufarosifodomuxoxagid.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/78346606215.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210718_030908.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_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 18788 bytes
SHA-256: f0c24302d50d0f2d8d6f0b0b6f9201d9cf3d26612371feb01d47b115129a9d5e
font_01_sfnt_off00012257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12257 10692 bytes
SHA-256: cb1f568ee00a7e2bb6a7e57df89db754ed8918d0e40591795b62941a8e82dcc9
font_02_sfnt_off00013ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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