Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fa9dcf7826b8cd…

MALICIOUS

PDF

93.0 KB Created: 2021-09-01 11:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5430bacf7e8e841356fa9a4e76d5b52 SHA-1: 27ca726c2daf25d89dea108bc94efe5dc876c533 SHA-256: 18fa9dcf7826b8cd86edbd56d9f23d98af4aecd8bb756908c8b05e5b20e80080
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV heuristic strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://rollfactorytogo.com/uploads/files/nutegelexokosu.pdf In PDF document text
    • http://okmarin.ru/userfiles/file/loxipitagi.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/5954095646.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/jidebisumifaromigigejofu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ad14a6ead9292b4af4d45497b5e7477e/befajavobofukazutox.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/285eb93dbbfba766ebb3eebf0986e846/55847364601.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a228a07591---nopulowunemedofixejudemop.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/69274245841.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608616f11f69d---nonikiduzew.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/96682794964.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a4e9493633a14a8b1e6491810c5d7231/wujiregazaj.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/kimewigajiluvib.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/81968026077.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608711a48d30a---xalimaxapetajitorawozo.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6036bb4ccd99b921b644b5a262d45dbc/ferunawuzugorapizurelarip.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6fcd8c53a80ea5fc654224c14aa17d24/numaj.pdfIn PDF document text
    • http://ipublicity.cz/data/file/67019794375.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/59209995087.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/gezorisizojevusewibava.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43af42f6c4---10931052947.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7efed86fd92715571a0cd8d8d57071e8/8924073133.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/wiriju.pdfIn PDF document text
    • https://hoalavender.net/upload/files/71971798039.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/45235907689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=graduate+data+analyst+cover+letterPDF 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_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 10592 bytes
SHA-256: b900e3228c4b59851c00788162be21c6725cdd68db5214953032c787c836d686
font_01_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 18048 bytes
SHA-256: ac7bcaf7fe9cf29f6704211e8521b58e56c2a261cee22618ad5f9cbe48b82ac2
font_02_sfnt_off00014d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1