Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8fe424fdb51a9a…

MALICIOUS

PDF

90.1 KB Created: 2021-07-22 11:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 663edd5b4342c03415c6237a5009c2d4 SHA-1: dc2c157dc56a2a3f9179332e4d8dbb152b716d3a SHA-256: 4d8fe424fdb51a9aff0ca377b111267bb3f4507a15b246135f6cdf118dd3ac41
96 Risk Score

Malware Insights

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

This PDF file contains a large number of links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed as a link farm. The primary purpose appears to be directing users to external, potentially malicious, content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607761ea2a146---guburokof.pdf In PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/46d4bcd7ea2d43e84c8774e7c80a0880/vebiximulalesexafoloka.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/2eb143f0e231d8eb95c551da740ce7a9/59440361207.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/57022171294.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/vomorazalixono.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e64b09a941e---16876488733.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g0oebcpejcnb9g9l73mstotc61/2729491419.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/rinoxifemu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a6468bf97---6922757674.pdfIn PDF document text
    • http://boxethai38.comupload/file/81873927878.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609254131108a---70439290258.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/jiwemigufujefevewetajofud.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a8dd781c---72249966161.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/19563372346.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/97fe520d098e720435f443d3b98d8197/56635318903.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/353bea531959b86b472c35f2d69375d9/22981976933.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/60139351154.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/2leo5qi4vrhkl5otlcvv727pe6/21050885256.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb34e6e705---25403241008.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a420a1d63b4---86002741470.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095f1b70636a---57321463152.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16082d0d21c38b---50339755819.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607092c4a16fd---68079413357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=swelling+under+tonguePDF 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_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 17328 bytes
SHA-256: 2789283f31b3c8ae984853f16112a31fb09997a07d0f3f9c019f4acdf46f9b71
font_01_sfnt_off00012ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DB 10356 bytes
SHA-256: afffcfcc71240e7004237bad5373fcee74c907b97f59947ddbf9decf5dfa751c

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