Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0758c6cf6f62d9…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 02:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12eeec29d7716a66e985ced4b62cb17f SHA-1: cab42aff5957908045b957bf8fcabddc59508140 SHA-256: 8c0758c6cf6f62d9730e99987d09dd6edb271d8bfb1ace396a9aeee13703a213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external URIs and is flagged as a link farm, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=reading+method+in+language+teaching+pdf PDF link annotation
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/encfnanv5bqms693lk8nrt6cf6/lemuribedol.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/75654462586.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f80b79889---weduzujoxe.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/49b8a0ccb4ec446d1047b55719fa8690/zabiraxote.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/moruwimowib.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160944b799c108---67758593498.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/bizofogidogad.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e391739174---jirumowujelidipogaxod.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a653b143---xezofisowebarewoku.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9257f10ff13ce946d401cc102f49044b/52266432716.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/1lpefi5ppnviisd7n5tnk48nf6/6282008290.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/kotisabubalatifatog.pdfIn PDF document text
    • https://fratellifurloni.it/file/ropanu.pdfIn PDF document text
    • http://tradotel-riviera.com/file/sotagug.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ab03d04148b538bee1b362765ea8e681/5458694599.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/96009300110.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/42863868328.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/eebcf9b4d522632f78d1729e8d5ef2c2/98946219328.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/wukedatovabi.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/70978052420.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16095a04bf3a8c---78842609935.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beec5f88cca---rokumipixokazidofuja.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/kaguvebokizipamufo.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_off0000c7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D4 18304 bytes
SHA-256: 633919e2086909c82073031f49e6e9a69c813f10ee4984f54dad14bd87580156
font_01_sfnt_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 10944 bytes
SHA-256: 6648158ff98f8526dcd56e89e5dd36c8b30bf941d7c419b619973f38160761e8
font_02_sfnt_off000110ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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