Malicious PDF — malware analysis report

Static analysis result for SHA-256 da53338521516517…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 03:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ae9061d9d35072c2e4b46f7f6c48cac9 SHA-1: 0a7d1a0e8c6ff51c582c2a01d838d3b0d6f44a06 SHA-256: da53338521516517a659674bcfaa55f4b9c56a9222b444041a73e9352dbcc9be
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=free+fortnite+item+codes PDF link annotation
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/rbn61rufpi2df7u1bmqjopffs5/43646754409.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24749844093.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/memoda.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/91954655577.pdfIn PDF document text
    • https://norservis.info/files/files/60141081479.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/79663284612.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a907d9c214934c7699a79cb94b4233ac/97006415673.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/vufamemalazolazirilap.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/guzivagamuzodejuvu.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/nuvewurafujumiras.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/40889529241.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/78118564891.pdfIn PDF document text
    • http://fpole.ru/sadm_files/88682319127.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/laxevaxogobapa.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ef2dc8e1444ddae5c1b702257a644b28/82672688244.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/tewegazosafilo.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/98266183819.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130796f2013b---15596866452.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/47481778706.pdfIn PDF document text
    • http://envigest.cz/upload/file/54168215670.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447cb7de52e---tozaledewazomik.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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 18464 bytes
SHA-256: 9097a034448f8aca1c3be8058f55d6a724bc4191534e96c51cb63489578e9736
font_01_sfnt_off00010d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 10408 bytes
SHA-256: 4538abe7f8fa68917364b16e7523da06e9043420d9e501d3d4c74e045e1ba6f6
font_02_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1