Malicious PDF — malware analysis report

Static analysis result for SHA-256 4973fde1107ec3ce…

MALICIOUS

PDF

85.6 KB Created: 2021-07-14 05:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5b94e9e7098c3fc2293990c4e662e93e SHA-1: 572ecb64348c67fcb3e14365c35ebf846f1db4cf SHA-256: 4973fde1107ec3ce4a9979dcc2c6da74167458f28182dcb7a3fc7eca2a3bf1d5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://acrgroup.nl/userfiles/file/sebafopexibuwagobariko.pdf In PDF document text
    • https://hiperaktivite.info/userfiles/files/44714070730.pdfIn PDF document text
    • http://industrialdevices.in/uploads/nuwalemowapojaxipuw.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/83709027612.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8baba0e329872111d72e3ae03c6fcb2c/26286371873.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c957ef2d59efe8301554c0bf95520c4e/92332424031.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/qubo0qlhi96d3i1f9ngske7jcf/vazelajifamu.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1512311e6---42231054683.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f19d82dd6---74243580132.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb9a84a1d---6842416395.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/dobuzivifemapenugikafupot.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/jujawe.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1886a85a69698703d5455cc1f058d116/22551225237.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/nupipevaluxipuxep.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8eb48c665---papufiluvovi.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e508727ff96a5c8a12ee7a2fd88f38ad/976535707.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b11c9fbeb---rewug.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/lexojerixiwivikijazif.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4kf25rciccjsnnlkdih36c4cmp/mizitotejip.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4a593b15---31261974735.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0a3639ce6---21232582484.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/30594746547.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/94tq6s9s4q4cu75ntq30ga4kj1/vevakudelevonadadego.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/kukanabulotibidemow.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/97428794708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=doreen+virtue+a+course+in+miraclesPDF 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_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 16836 bytes
SHA-256: bb47ce39e27e8015566950ee80f7585e397c3824ee70370bee49ddd96502f19f
font_01_sfnt_off000118c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D9 10560 bytes
SHA-256: 7fc72541c32a02868499e5213f533d29eee790c9c5c71d4e8d8a4ea126d93462