Malicious PDF — malware analysis report

Static analysis result for SHA-256 f207a56be3c2c479…

MALICIOUS

PDF

120.6 KB Created: 2021-08-07 02:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2653a6db0c4b83bbde6367bc8c4de1fe SHA-1: dd9210be48134c76178ee38fd386c86a765c5716 SHA-256: f207a56be3c2c479760ac2b4807c4c279fb5c5811300a7eeab3da90391c58e1b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cortabellanews.com/userimages/68461483950.pdf In PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a25e0d773f1---83156017315.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gezuvamip.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1593a0b5ca---50599152360.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/e53175ce1beac29fac8a8d4d4209cc54/66292421499.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6c7163af---kimogise.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/qnmvvsfpd49ijva9ajm1dkq241/74977170977.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/g9cgt81f2bce90rl1g0drprnas/bowekitukugowoxujexiziw.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/kerozuve.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959ddc1351f---44527311792.pdfIn PDF document text
    • http://geraldinekilkelly.ie/soworulexegened.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92514962097.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/sutolazediluvugulibupu.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/65004840175.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/5346180dca50c075fe6d2ca0e7504dfb/bakirujuzalodemolifen.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5f5d8687e---6273224994.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43245155987.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/segajinisek.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/tunipunikosi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9jp4jrb9utfh3g520c28hb17v5/nerilanuripo.pdfIn PDF document text
    • https://noddy.nu/images/file/damolikikus.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5c08ed73a09c1bf8d220f5c059b13075/1227492150.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/84820193656.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/tufarefixevof.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d67819b5523---faxesavazutevivanizaxilak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+does+the+ground+state+electron+configuration+of+the+hydrogen+atom+differPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D1 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_01_sfnt_off00016969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16969 21860 bytes
SHA-256: 4ef895335d46ae6b19d903bbacb6903b2f6799de6548d8e3f0e496fbdd37f0d6
font_02_sfnt_off0001a06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A06F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001b886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B886 11212 bytes
SHA-256: f84b40f2dd510134e7e7c5e92f445cc4579fa1960cc1a9bc8f118552b563382e

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