Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6174f158049590…

MALICIOUS

PDF

75.3 KB Created: 2021-09-08 17:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 94a81f6ee25a52d6341d6d1beb600549 SHA-1: 8963294ff26f6ff89c80dd98a3e04eaef7f1efe9 SHA-256: 8b6174f158049590e1661a65ce4c144875ab05dde40b86cbd2273ab6aa67ba76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://jocoseatee.com/userfiles/files/pelavasupilifovesojavowup.pdf In PDF document text
    • http://yuqiaohome.com/uploads/files/202108312356469976.pdfIn PDF document text
    • http://tayles.com/uploaded/dijezinakafuvegebapevof.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/tixemowifejumo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133dff9472d2---89559394442.pdfIn PDF document text
    • https://tl-systems.hu/files/files/devopadanoletiniw.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/74812346672.pdfIn PDF document text
    • https://conrays.ru/f/data/dulabidefinaw.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/legarigur.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109042000346147.pdfIn PDF document text
    • http://htwy.com/upload/file/vowukebaditowule.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/famujumiratajodeluli.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/70433207921.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8be5fb0ff673ec2b43876c3d404f7de3/bewugadelile.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/31813635287.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/80565471551.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/rumepevezaxawupo.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/gejibizipovubavenitanida.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/dosigodogevurepemem.pdfIn PDF document text
    • http://splogservice.ru/content/files/78096551072.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/fezelijuroxetebewizob.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/eou07u5nod9c0vd8mh7aphljq0/lifaxiguzakabuvuguparebu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4b17ffe8---71877363119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=44+phonetic+symbols+with+examples+pdfPDF 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_off0000bf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF59 18084 bytes
SHA-256: d84c604703d9e73eb281b71f6a63ea124d71040f1be2d405b07614374f368716
font_01_sfnt_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 11208 bytes
SHA-256: fc5b3d019b9d2f8370e127ad5fe83d6b803f770a196c77043eb9a44b07f3f360
font_02_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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