Malicious PDF — malware analysis report

Static analysis result for SHA-256 858e6013517285c6…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 05:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 83aa16cba130a97e86b781ef1b2a0029 SHA-1: 0b97a02e2bce4d7b10332b46677faedc4b176527 SHA-256: 858e6013517285c6afb7e933e491d03d9f0bd43dc1a83df76d2db83f8f041647
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using multiple distinct hosts with single links, suggesting an attempt to evade detection or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=minecraft+0.17+0.1+apk+download PDF link annotation
    • http://ekorob.pl/userfiles/file/73390456941.pdfIn PDF document text
    • https://mediaskills.rs/files/2965821151.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/dunewukopoderodiwediw.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/13292117654.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/45268708045.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/57254783445.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/xisimamopik.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///19240928364.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/vujotisetixudevi.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/19662017931.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/496b72d7c88fdba7616f9509de251b13/lovuvumedivixakurufas.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/36435743085.pdfIn PDF document text
    • https://onecre.com/images/content/files/rugarotekuwijulafozo.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/78990674345.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614befa623920---62885724121.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/69142846586.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/gafiwisop.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/35226938693.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1a6cbf0c16c5744c93c30b0478f7fbec/49134972395.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/8923904735.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/duwowusamogamekiju.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/ranarubirusenuvemufuna.pdfIn PDF document text
    • http://benetalent.com/upload/files/52516038172.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/nodenalukoxobugo.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_off0000b316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB316 16192 bytes
SHA-256: b471c107be7d6d941f376badacc0a8dd7b24c3995b2033b9bc633bbb314af10c
font_01_sfnt_off0000dc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 10904 bytes
SHA-256: 5a6a7d95396e4b1aecf2e782a91334b0783359c60a5abbdc949b301502571fb4

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