Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fd228eacb318c1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 09:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dfdcd07e173fec0776d3abaf807d0087 SHA-1: 77582d2329180289f128f4a27cde65298ad6f38b SHA-256: 35fd228eacb318c15203ef4ff58699120991f87a461abe1f2fa6697e35b62029
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites and disposable domains, which host other PDF files. This behavior is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=how+do+i+select+all+photos PDF link annotation
    • http://pelejas.com/IMAGENS/CKFINDER/files/zopopowapibunu.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/52909400350.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132908c9ee7e---dubijitexabal.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/601d473b175fab63200b64bb6279c89e/59005985229.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/28101714739.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/27509867013.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/45636885938.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/wamexetumevaxupida.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/1517009510.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/01d482a281cf6ea43c817b38ece62baf.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/pebesugazopasutawolov.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/menanibevopumib.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb21d47827---nulizuxi.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mufosugoxuvuna.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/wobewotononatoxab.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/14694439166130c4801e66f.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/51674192808.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3cc4d5b3fea9d158c21ff6ab002c217d/mezitarimaditiv.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7gdua6ji1837dpq2n7qn9soj50/49771055603.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210912_D8BD8F5132329EAC.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/87679840875.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/69392153621.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/kuxejizakekumewiji.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/wakorevovikex.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_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 17612 bytes
SHA-256: 7be7330163c6091323a9ab954c0433b94788611d76df0873911696e3c299ea72
font_01_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 10484 bytes
SHA-256: 7717077e446bb9d089c2d775bb57765c5b7d97dcf1df721168bf161fe0bf433c

Open this report in the interactive analyzer, or submit your own file for analysis.