Malicious PDF — malware analysis report

Static analysis result for SHA-256 414bffb41fadfd35…

MALICIOUS

PDF

74.5 KB Created: 2021-09-05 21:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e948701b0eefd96c5d6464c09e93329a SHA-1: 43ebbc4a4989cd8489469325df61b46d569534bb SHA-256: 414bffb41fadfd35c950d427e99037da0e84feed14e41131df25aa4f75fda5e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=bluedio+hi+earbuds+manual PDF link annotation
    • http://limoride.net/gallery/file/jubabapazidavu.pdfIn PDF document text
    • http://leton.pl/userfiles/file/jejowodujuf.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160820b7e0d10f---lebiganojujalidip.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210712212455.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cc9128b6f59f2f3285ff4a574adec039/79822134116.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qj62lcu0p6js3h23uel7e3fsvg/75371923080.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/zekumedifololawuposojol.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/xekuzija.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/xizikoteraj.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9361a155---11277302603.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/xafomud.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f705e47014ff97d7c4ff0f45ce778795/bozakofakegolopamunegalez.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/84836950626.pdfIn PDF document text
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/heg154e2mlfu01i01bht8cct6e/kuval.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/90261309540.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/49482990467.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/37309577584.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/faxuzanemavupumafo.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/vokugedutujow.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8693b9163---zajozotizemamefoxege.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/lapojilirojegabevajar.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///33688753325.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/nebalujed.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/menilakov.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_off0000be17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE17 10708 bytes
SHA-256: c1b2194b47de35325c11fa37b9d2141ce8119461a711dd6580cf2def3a40df3e
font_01_sfnt_off0000d669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 16940 bytes
SHA-256: 9b476213a974e182123ceeb2b30b9e3f77080784cddd6ddd330963e84888aab9

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