Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e4746abd39bd3b…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 14:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1dfba81b6a8218549e59ac108a0de44 SHA-1: c60155ca74f1e8c152b4cb7e6848fbcca25616c3 SHA-256: a3e4746abd39bd3ba231720cff7bfe2c5e2a645b9aa91994cbdb58b0f69d1fbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=books+recommended+by+bill+gates+and+warren+buffett
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ab2f368aee2579fec2dfd7f946871ea/dimeke.pdf
    • http://a-aqua.fr/ressource/site-image/files/82706679531.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3qrfdfd0ehu54hidb35oi715uk/40147016692.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922cc313260---80030121703.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d952b8a83---jadidamupox.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/88272015703.pdf
    • http://jullien38.com/ressource/site-image/files/62266907572.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/eeb347fa39725e7010e37c95ed9fe3a6/32713921469.pdf
    • http://anhuifan.com/upload_fck/file/2021-6-24/20210624182243285419.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/6ce3bd2703f0d4a0e8c81c4f6603117e/36863708923.pdf
    • https://a2designbg.com/userfiles/file/suvaxujuzitexadir.pdf
    • https://premium-house.uz/images/file/9674728762.pdf
    • http://halaljones.com/uploads/files/76065364300.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabede7276f---kukusitofibamitokava.pdf
    • https://247christianity.org/fckeditor/userfiles/file/225549555031621537973.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4a661266f5e46cddbb2fb9209272108e/felijokitetonifuboxepejo.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a46369af1---rerekoximum.pdf
    • http://teraval.cz/res/file/kinapunoje.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b76875c2f38577c77baecfa8c5b149c4/32692253309.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c4759664---43565342414.pdf
    • http://penzionriverside.cz/files/file/damesusafujipi.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086be173b279---44172118459.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb0.bin
f4aa587fa0830f76f77651492d72c13d344783a2b48403b8b2f9dbe033a63219
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 11404 bytes
font_01_sfnt_off00010787.bin
50dba0f5a9590777b635ea70ca219c3043e93acfd27fdef424e81abb4a7cdd95
pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 17368 bytes
font_02_sfnt_off000134d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134D9 16792 bytes