Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e4d7d834726a25…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 20:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ecfbc75db2d932f1a4031739171749f3 SHA-1: 296fbf158deac54556198286ead5367c5ef0ccc4 SHA-256: 44e4d7d834726a25f70a126d4c5ea470e006af9bb3d90d6b98a0d2439b4390b9
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic confirms the primary attack vector involves directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=friends+season+1+watch+free+online PDF link annotation
    • https://wronba.pl/uploads/wysiwyg/file/wizegolo.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/80455232105.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/mazoxuk.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-7/20210907015645870075.pdfIn PDF document text
    • http://stonebreaker.at/7742000085.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/35156754537.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/2344624375.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/59320491869.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebced01dc5---97305616129.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/23724276689.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/96974855625.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/fugugagis.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210905203222.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/19244898073.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b6a070152548d5a9352271a0a9f1016d/dilojomupebefujazikepel.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/67383549836.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355858a85a3---91971549777.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a2aac1c6---pijamivavokovofubojuvep.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaaf1e7ab---tazugosajalejo.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/jijalalezavizamaxo.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75750773282.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/xibedodigarepuzigesusi.pdfPDF link annotation
    • https://dildendilecevirievi.com/upload/ckfinder/files/mumititivumiletoxugagem.pdfIn PDF document text
    • 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_off0000d48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 10688 bytes
SHA-256: 9b741dc0e0711c888fc0f66f6bcfb55d63ad80bf8c81a97d7299e16699f3478d
font_02_sfnt_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 18020 bytes
SHA-256: 73de79d39d5122f9095e63120bdb0358e9641df4fa3b308a21419a489a7bc43c