Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f4dfefb2baf281…

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 14:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aaabada135e0e33a4561ecdfe84d4b04 SHA-1: dae3031f37613e2e0aa36c299302d358da3b2f96 SHA-256: 99f4dfefb2baf2817697461b29a4da7b0ddefaac89e5452eab2ad00be5ff2617
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious websites. Heuristics indicate these links are hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=sniper+strike+game+download PDF link annotation
    • http://wsp.pl/userfiles/file/15916058767.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/32131218324.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/937620072.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131d651112e3---83545969798.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/kuxuzigubapogewomonasak.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/tudanepidig.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/zitanubabojemefodojif.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161313c93c989b---86418261612.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/60953218559.pdfIn PDF document text
    • http://gnox.vn/upload/files/rinexuvurusutuwamexax.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/vuzijuwasotevutudadanuru.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fesetesawububaz.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/14115618187.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/87314338074.pdfIn PDF document text
    • https://partetesal.ir/data/file/74224769079.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/sikusadawobipov.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/garukojigetefip.pdfIn PDF document text
    • http://zenkatsu.dk/files/60363637420.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/69569298250.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/naziwudajaz.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/pesituwavija.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/71182932593.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/fisamo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/64e9cc73560e4486f2b68ad10e0a2fb3/26708660010.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/39486188846.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/pusez.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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 18088 bytes
SHA-256: 8bb7fe457b139b79d52aaa1d913d45824260bcc5108da52f550f4713e9f99544
font_02_sfnt_off0001326a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326A 10988 bytes
SHA-256: 41ead9424f6da82e716ec13f2e17e70602133b7ca91ee7f7940459c88a0f8a72