Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0988b2a8bdcf3e1…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 16:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ebf522e160159bbfdbc21320752b8e90 SHA-1: b552f3c2bb39d38b90f0626e2b5ad3b6797ad1af SHA-256: d0988b2a8bdcf3e1975f89180ae6f8e459323dc8127e9d50f1ff17e7f9369964
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall detection by security tools indicate a high likelihood of malicious intent, possibly to redirect users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://youandisagenix.com/ckfinder/userfiles/files/64065468135.pdf In PDF document text
    • http://ekhoron21.mn/uploads/files/rupufevifenidadamemazuru.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7663d5127b95ed60413d7611074655a1/fowodanukimufexuzilevobe.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e64581875521113ac28d3bedaab577da/36004800456.pdfIn PDF document text
    • http://avemkz.internet-match.com/upload/files/59872020519.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/32523986133.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/89606631718.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161489ad969e4f---mimexulekojijawaretigul.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/78aeed068be213408a97b5113cae18c4/30296387931.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/51525916165.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613379e62b199---56886984675.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/worolulimininopufipuxa.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/72033061870.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/56834307240.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/gejab.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e09186f25f---85385106390.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/tufegagafezerabev.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/85439986167.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-23/images/files/46128953026.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/rezadadavizef.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/vefogubunuwu.pdfIn PDF document text
    • https://apagar.cinemadossertoes.com/ckfinder/files/69629543144.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/48315800819.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/norakafog.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/wonozuvix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cube+live+wallpaperPDF link annotation
    • 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_off0000b2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AA 10176 bytes
SHA-256: 5dfeee7f13984e5adaabc803bbe368e8e7b532343d0eabce8681a78d98203db4
font_01_sfnt_off0000c965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 16164 bytes
SHA-256: 47b2a39952619136d90644f87d762847361d914d2fabe5c6b1d9fd32e95a16f5