Malicious PDF — malware analysis report

Static analysis result for SHA-256 1066082bf55813cc…

MALICIOUS

PDF

87.1 KB Created: 2021-07-19 00:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 668956d66068388d390a16ce43bfa4c1 SHA-1: d0b08f848170708375a5cd957c3c159ee914c044 SHA-256: 1066082bf55813ccb2b458fb48b0dc43c9f31903e81f019a3ec97b2dc5a0e7b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The primary purpose appears to be SEO manipulation or distributing further malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nextgt.eu/uploads/file/jotirujokinosiviperomene.pdf In PDF document text
    • http://contactconfiance.com/files/files/vasoruga.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/66420638923.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/903c5b03470762d612fbc2bd884fe5ea/10465358297.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/99559129239.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b07a27f65---xasutuvinali.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e76e5201bde---negabitari.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f2d31b642a0521a89b52d78b3556073/gememusidalemelijulikafe.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/rukexufelexikegezuxu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8f3bcd71---98264282168.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/49636812102.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/80395349536.pdfIn PDF document text
    • http://ridendo.cz/files/file/62817373284.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f9a1eee0a---xewulo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be7b02939a0---topegapivaruwuxisuneg.pdfIn PDF document text
    • https://pellevah.com/upload/files/nedemogi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e3fa3b55ad4---4484121879.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/21eeddace33a097695c2f8efeffbf159/kubazolasejivemoxaze.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083410b421e6---34629418453.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/nulebuxexa.pdfIn PDF document text
    • http://topas.lt/userfiles/file/mowasoku.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc545d5a279---32967897137.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/5b8aec4e2ee2a8214639d0c5f77b025d/sosazilunovifonexu.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/39246318121.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec981ad9678---bazokikubibagobojomat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=examples+of+psychomotor+activityPDF 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_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 17244 bytes
SHA-256: ce5f6df005834b2843941db60f6d79e5d089541985e387ad62782968b59f1d54
font_02_sfnt_off00013604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13604 10904 bytes
SHA-256: d5bd81484210c7fd5a9b6291b9f0ee7c579ad4534a6ffd20a0644d2bad797c6d