Malicious PDF — malware analysis report

Static analysis result for SHA-256 a507572438f7c2bd…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 16:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 251dbc180d386d668edcae3746ac00f4 SHA-1: af260d9f6d8337041f57236c9782ae63d82e3e28 SHA-256: a507572438f7c2bd751b055271e1c90a65f57f4f15975e82b089e2f77692553a
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 an embedded JavaScript stream and numerous external URIs that form a link farm, likely intended to redirect users to phishing sites or download further malware. The presence of JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://smidgel.ru/uplcv?utm_term=parts+of+stomach+ache PDF link annotation
    • https://www.rougeindigo.com/ckfinder/userfiles/files/silominuwudufisuzibepasi.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/85725919810.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/60347796792.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/36691888935.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5f63a5c26a2ddd89410fef2f329fb0b5/53778327151.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613915a2af8a1---wepivazasewisuguxojo.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/6919457497.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/fojanuvajunusuzorixebini.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/252n7fb6khe00moj715kldpn3b/65657983238.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210901225314.pdfIn PDF document text
    • http://brukbet.com/user_images/file/fitebipujimexuxunagi.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/botonewegupunedu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/qc2i0nlmfm7uibqms389jcc291/54320306071.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/33970768299.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f02f12f0---dajube.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/67669248082.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210908184833.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/farexe.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/pajera.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/11093760345.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/75713183782.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/73141755879.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/makaguzojosesumuxebarekig.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/07cbb20d208e711cdcf03081d76841ff/ruzasaw.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/32138243516.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_off0000ca3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 16472 bytes
SHA-256: bcc17e04ade4a21ff4dc73e30a72157f25de8062941a24e29ccf4407d13fc03f
font_01_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 10360 bytes
SHA-256: 4bd062bc04a0ba5a98b085b255e5057319706869a8604557d26abef5818d8529
font_02_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1