Malicious PDF — malware analysis report

Static analysis result for SHA-256 672a542b849b0785…

MALICIOUS

PDF

90.2 KB Created: 2021-09-04 17:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b48b41b7cc4b4d8df69f46ce49b0900 SHA-1: 5390a177b48bcb9ae783a99270fafb65f361dceb SHA-256: 672a542b849b0785de21b24e64564f43b843f3f176eec53e6d1c0a151db8a891
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and potentially disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user interaction but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://atlastoursntravels.com/userfiles/file/2200840719.pdf In PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/vurapado.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b590c8d55fd---wokutumenofojipe.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a933232dfd8---lodozugokagalevibab.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbc25ed996---52290768941.pdfIn PDF document text
    • http://jaatkinson.com/userimages/muvasomerugonil.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607459b197f06---53105109892.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0575d57367---10714299266.pdfIn PDF document text
    • https://buyafranchise.org/files/files/29795517250.pdfIn PDF document text
    • https://eventaipei.com/upload/files/59694131494.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c4d925b92---56689153208.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/popunetereretage.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea9099703d---toviwudusosa.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/norudimogo.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd5e690e4ecc2ba5ba911100ef21f8d9/pivutuwanufag.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160721bdc153bc---zabifugixupejuwugev.pdfIn PDF document text
    • https://irrisyst.eu/files/file/34111077809.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/28609847932.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/zidago.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/33840459919.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161007de32e02f---12972452914.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/lutuwa.pdfIn PDF document text
    • https://securitydm.com/slicice/file/jipuzamemerekebatorewed.pdfIn PDF document text
    • http://airfa.it/userfiles/file/33142797217.pdfIn PDF document text
    • https://buka.ru/sadm_files/bepede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dysgraphia+teaching+strategies+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_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 18864 bytes
SHA-256: 8c648cc696ae7b07300fce2a467142185dc252254b9bf70b3a9b133cf982eb2d
font_02_sfnt_off00014258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14258 10848 bytes
SHA-256: 60d9ed6de13400242803a9e335189eab46157ea95a3b5b69cc51bb28a7ff9fd8

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