Malicious PDF — malware analysis report

Static analysis result for SHA-256 631e6649bebb9595…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 04:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c658c24dddeee0583f5470e01c53b26 SHA-1: 98ea5a0b48f532a05737befd19f6c14062e68c44 SHA-256: 631e6649bebb95957f80bf04a81b717e848882e106b776781f87ef4b7a29c34e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised WordPress uploads, suggesting a tactic to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://extracam.es/app/webroot/arxius/file/wibefifofabod.pdf In PDF document text
    • http://sam-global.info/files/file/79138343600.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/smfj42a1mi759pouii027f61rb/nemukiganizanitaw.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/508ec81e4845924a45bde9062252d53b/wugirelozoduramidemiru.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/85353163719.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/xazuwijakikako.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fdabba4ba---72123663871.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/36969037710.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a44875d4d88---4618916048.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/01bb76c9afe2e537db1bf7ad47533f67/nibeguxokaditinixabufuju.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/lusovulubapexekeloluduma.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/15141326924.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/jifozituge.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dce13npo3l0dpcclpb3uomdgtq/96960426050.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d72a6d0188b---43431300844.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/4jlec5t0htvmtstf57fhsn13tg/11688383659.pdfIn PDF document text
    • https://nada70.org/userfiles/file/21935553279.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/62801751395.pdfIn PDF document text
    • http://centronegozi.com/public/95832399722.pdfIn PDF document text
    • http://coffee33.ru/archive/file/tolapewodurofuderijesosa.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/67440208661.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607818ab2db60---7750748409.pdfIn PDF document text
    • https://wildnaturetravel.com/File/sosifafudizejigovew.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/8f2m8sq35movm8gdro2kjp6v3f/jarixisedot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=washington+county+tax+assessmentPDF 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_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 10840 bytes
SHA-256: 140a2915cef85a3ebd85553978517ce50908cca6e329bfa98a358afc5c5591c1
font_01_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 16808 bytes
SHA-256: b98917ae41efa1e275e88ef3004b17d8eaa4aca7ab97bd7405722405481fa88d
font_02_sfnt_off00013110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.