Malicious PDF — malware analysis report

Static analysis result for SHA-256 858ab9a70285f249…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 21:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df4ef727e9b440caccdd0f5a30e2a9d1 SHA-1: b49ed3c198f052c348d44a8ad4329b489ad62bcd SHA-256: 858ab9a70285f24948f2c9e7c764cce517c04b3f5471526a970501c8f620a8a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=how+much+ram+is+in+my+phone PDF link annotation
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/knh2hdv34ifc4bhfhh43l61mub/45965948192.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/52180456368.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090804270792.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/8610900766.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/tafuwowobusupidakivegat.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f283e467d9a312ab4b1d1d0975ff14ae/56498854208.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///85585480091.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/43278632635.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/zutosovafovo.pdfIn PDF document text
    • https://maymac.info/userfiles/file/63140594240.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/zuzidavenamogibejugov.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d31579d283d6ed59544587dd24210b64/jowajatafudoxubuwu.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/bibivazexunazufijer.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/79279515809.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613832571d907---lobegiz.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/witipubavisanuvoxa.pdfIn PDF document text
    • http://vswet.ru/f/vaniro.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa87d2c802---zivetenoniwekubotuzafapi.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090111184544.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/nitefarav.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/xagavasizuzujepotup.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/zumapitez.pdfIn PDF document text
    • https://priscar.com/documents/files/21152942959.pdfIn PDF document text
    • https://italvaping.com/file/jowokosopifojepu.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/14562939548.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/12330380061.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_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 10784 bytes
SHA-256: 8503fafa887ae758d26dc33eeb491b50f8cf8e48dff0ea5a6449e4d729b03910
font_01_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 17220 bytes
SHA-256: b9cfe2c3218f3767dc8dd7f2f144751abf49d2d6f7a3f27ba669d3627dad37ed
font_02_sfnt_off00012104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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