Malicious PDF — malware analysis report

Static analysis result for SHA-256 57127952dbcc4837…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 03:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb91f7f661b5af6539cb536d9b640f7b SHA-1: 5bbc466a007f13170b454d32f571794605dba4e0 SHA-256: 57127952dbcc48372c76a9d8b249deab4b581f5abaa0e37a623e47d23d42b85f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://datavincity.com/uploads/ckfinder/files/93533170968.pdf In PDF document text
    • https://5of7edwardstreet.com/assets/media/files/40095700601.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/smsfge38qv5ik9p7qh1bc47ic4/jikegogekuzobisexivuf.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/63703f123bd954f6abc281af54a48bf0/bukozudebutudaxagubumitov.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/fodevoxotinajako.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5456cada5---85232852583.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/lisewevapipowavebi.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/59615886396.pdfIn PDF document text
    • http://secretinvitation.net/images/files/vivejexuvegojaxozoz.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/kexetiwoku.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/46648678459.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/kagabakezadotubaton.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/58807981173.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/79247295764.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/4149103512.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613724391d0c2---juxofibujasi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea5c609ccd---jurixoxuvu.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109021201327514.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/fodid.pdfIn PDF document text
    • http://eternaseguros.net/files/files/26346011991.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e532225a9---2420040628.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/sigoj.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/12033940357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=discord+phone+webcamPDF 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_off0000ceee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEE 10860 bytes
SHA-256: 82353159f9487e9439ddbbcaf5f6e4e31694dd874112694318684053e1fbcfec
font_01_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 17348 bytes
SHA-256: 454696d05dbc44410425a2fbe9b8986ca3a3fc5624dbc5486231f589e4380a7f

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