Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea166dc1eb80f6b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 14:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6417e9cddb23a9b0b2ac32b8471ac164 SHA-1: b9aa85aee9407c82e5d7bd50d5be572bfe08d292 SHA-256: aea166dc1eb80f6b078a699b267e9d42125a7e52b9c11f8824c113deada5cd57
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=fema+floodproofing+manual PDF link annotation
    • http://mynigaoe.com/upload/file/20210508072456.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/57539046189.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/moxebojitolidomav.pdfIn PDF document text
    • http://trivio.it/userfiles/files/xozapejinorepad.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f34206d7a---57577289781.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/barepagofiz.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609421bec44c4---xezikex.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e6372fa1---59692581875.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/xojavewedosalerijo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kuxab.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b9082fa560886fac57555119dd3aa173/98141777232.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891e4e3ce50---2674814009.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/jenevoluraverujefuxuk.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2133b76d6d06dc59155459280e04433b/38767733937.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/96778280510.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/27915704579.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/92431140041.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/68508171195.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/svljtjse7omhdgnklsfnpkhj0d/kibanajinamog.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e17f0f0624---81434722503.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/57835586810.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/wumasesiw.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_off0000ce69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 10652 bytes
SHA-256: 42727580612797d43d516437c56003d704e19db073926c61651f44f2b451a8af
font_02_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 17084 bytes
SHA-256: 5d35b9c5ac2d5700d2de3c295073b162999a8c58237489af356f8928980d8042

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