Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf12dd80729e6618…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 23:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1efb148fdfbef14547eda81e9f6e56ec SHA-1: 2a0985bb20d70431c98bd345ddfe364ea59edd99 SHA-256: bf12dd80729e66183079d095006a2dc6e12ddcf7ca83e9982e9615e3ef5eba3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. One URL specifically mentions 'download snaptube youtube video downloader', indicating a potential lure for users seeking software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://catamma.ru/uplcv?utm_term=download+snaptube+youtube+video+downloader PDF link annotation
    • https://beta.nhatthiengroup.com/files/uploaded/files/vavorewirikizafokoxi.pdfIn PDF document text
    • https://spyboarcams.com/files/28309527045.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/ripujasarewa.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/30140927695.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/xevanakezefonomaxiwu.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/baviwonas.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/jafaduvezazu.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/69843306471.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/mimojeli.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/13308252172.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/99884188599.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/govaworego.pdfIn PDF document text
    • http://koala-al.com/d/files/10880629436.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/toduseturamawigibo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613992d0e84b9---pixiniwunoxesidupidom.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/1706247322613e7320c118c.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c546d450f1---2662744384.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/51527787418.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/firupotedazoz.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210905_133BDB3E609AE544.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d795deae9c73a5b6e22467c34bc6a749/98662189702.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/digodewelarefofakofa.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/44147093363.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a670ff19ef---xuvarenunuxes.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/jujitagevin.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB679 20880 bytes
SHA-256: 2ed26a3defe03eb16ed1d170727cfaec6322eb868f21cdbab8a332e75c37212a
font_01_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 16336 bytes
SHA-256: 37fa009baa434e56c9d0f8ca1702f29491c8feadf2083bd43354ef44a2d54d92
font_02_sfnt_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_03_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000122e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E4 10892 bytes
SHA-256: 0eefe87fce675aca11f2edf714612177dd848c4852365a94fbcbdc143d2e91ca

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