Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97e88790cfbd7ef…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 02:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ed2722492572660004d5ee305cdb974 SHA-1: 5f28838a80e33e94a766211873493eda9d9fbc57 SHA-256: a97e88790cfbd7efc6c056b6557fc8787959c2bed4e19ca6c41fe075ea886084
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of creating numerous links on different hosts to improve search engine ranking or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=kendo+searchable+dropdown PDF link annotation
    • https://shreegroupco.com/userfiles/file/resemarunagavufizipageki.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210904_213650.pdfIn PDF document text
    • http://taigesw.com/upload/files/vixivudizo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/83bfa9362e783fb6d31d7b70ccd00941/41727059259.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/fejozukafelewimawivi.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/legogutasujap.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/tajaxosesaxotitudafokokim.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/pekupeleweguvomitet.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/40567238339.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/sapoxil.pdfIn PDF document text
    • http://vpsystem.com/files/fck/jiguwukedure.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/74871663260.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/towemerunajitez.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/74177050338.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/tinami.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/xalowulaxijumatudo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161312eb228ee2---rifekaduwaf.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/bemagesate.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161359431ed804---japob.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/xaxuragisiluwebajate.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/sevogofoni.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/68027254474.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/muxukodavowumapogatuzupiz.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/95560384253.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_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 18224 bytes
SHA-256: 5db3b7b65afe0f1fb43cab72056c1f9183a9ce61a92b773f8986b42a26329a7f
font_01_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001209f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209F 10640 bytes
SHA-256: 8d3587990ae83c7319b3a67e0fa43b83518d1a0272474b0e7f6e61c078343bac

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