Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c937215c96ff51…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 18:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4002957cbbeca906fe1fff7eee5ebbf5 SHA-1: f6a0ea270d4958c4dd9ae8c96d41b4846bb56b96 SHA-256: b2c937215c96ff51bdf9124dd9e621e55d065cae9899bd764cb840c09675c00d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=teaching+family+members+in+english+pdf PDF link annotation
    • http://burchiellati.com/file_fck/file/sajavufunegasizu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611f9ba547851---70312715755.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/wubisopenimutuk.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210721_070304.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc4ae42d7---3512202824.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/xikegur.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/vejotirugasepure.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/zonidasudelitezerud.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/73822751079.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/desunonu.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/kutikogezof.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/31822965824.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/64918488690.pdfIn PDF document text
    • http://poiskvod.ru/images/file/84883040866.pdfIn PDF document text
    • https://chp-travel.ir/data/file/gagukuzosudega.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/fusorimevusisalogorasadu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/cc6gts8eim9kfqg70b2ru230e8/84592385607.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b6a1e8659abc1499ccee4ba1d74e3b64/xugasulefizudokabofike.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51dbb22eb---46933785647.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/687c21599ad91230e8b8f53f9fe4b9b7/31423246400.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/wudixinuxojukonumejaf.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607b681ac9ea4---jineriwetufotemeko.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b3b560078---69608311330.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/60175217625.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_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 11064 bytes
SHA-256: e7f36517b9a17098c76da7947f1d12d5ec0415a15b985b62b9c61a1bba1fe30b
font_02_sfnt_off00010fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEE 18296 bytes
SHA-256: 6b47a51ba8bacbbc8ca2be69f80ad38666d47c36b6bb1ff876dee69235ba094d

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