Malicious PDF — malware analysis report

Static analysis result for SHA-256 053c57a02fb0a304…

MALICIOUS

PDF

99.4 KB Created: 2021-08-04 14:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8663b1bd706ae9af7632857b8e6d266 SHA-1: a8c613ca11a39e2289beacb97abd263462d1399a SHA-256: 053c57a02fb0a30485b249567bbb295bf50b6901824b307107f421f0bec764a8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content or phishing sites. No scripts were extracted from this sample, but the extensive use of external links suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=proyeccion+de+fisher+glucosa PDF link annotation
    • http://stardentalcare.org/userfiles/file/dabomorozirunonebepifepe.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a55173f2a96---70107947896.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/56606886803.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/eca215c86e5th28k63kplnr8kj/sijola.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/kakepeloripirevevakekenek.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/pukenuladarekitopomo.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/lapidonefokawazigad.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160701f4c8f6c1---donizurimifatamu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2f0110bd5efcfe94b54db42902d50f96/64528825332.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/14828782010.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf6253f89---nobixobesilawara.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/xebavut.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/dl8lgmq4daokd5ve1ks9f1etcq/nomuka.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/6vmp7odg366dhk520scbjl0kdn/sejowatatabo.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/ca024208163aba6a9fb2fa343d1a7ce1/74459530481.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160769dd0eba27---3206707776.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/57604089095.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/37054624752.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/21547034932.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/zukifitulozibawajawaj.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2e0e5ae09e9433523379ce9311c216b8/535153934.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/60679604770.pdfIn PDF document text
    • http://leton.pl/userfiles/file/fodijirowasijas.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/joripopaberezamakupexejis.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/63062948117.pdfIn PDF document text
    • https://dietacud.eu/upload/file/jitilikobebu.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_off00011c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5C 19392 bytes
SHA-256: ed92db752ff96b6e80733ba7706cec46605aab84ad6b632e0e935ed93375b5a7
font_01_sfnt_off00014d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0B 10872 bytes
SHA-256: dbb45a81dded99c919a90d00cb63e9eb995497ef4407afb14dffc85e54b87c2f
font_02_sfnt_off000165e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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