Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe1c3ff34ff807a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 20:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f1c76c939edd4b5b42fa7b31c488c131 SHA-1: 61c505acce8a38297b22b2f67b7ca0c5856a9bff SHA-256: 3fe1c3ff34ff807acd2a81df14ca53dc77fa9c6531f3c44120bfbc738ff095a6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are identified as link farms on disposable hosting or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be malformed, preventing analysis of its specific content.

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://pistant.ru/uplcv?utm_term=recent+telugu+movies+online PDF link annotation
    • http://chuabenhxuongkhop24h.com/images/files/24620310522.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/gosab.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/moxulilek.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/24974372222.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/navekijekuzotifizovis.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137eee7771f1---55913086022.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/xegemezijekakiposejoxofu.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/61293839444.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/84563370176.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210906_100142.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/kuwulovojifozasu.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109011759368260.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ffaa3fe12---kojalanav.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/bixawakif.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/11951802022.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133edba0cdad---5122432139.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/gasesuwijagulumigofakel.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/35961983014.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/nijogu.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/wawolewalepafidopuw.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/murifadoxedupofag.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/18256300472.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316889cec9b---64983997362.pdfIn PDF document text
    • https://educhina.mn/editor/files/4461238560.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_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 10520 bytes
SHA-256: bf97590e8d48f6f3812648172f54897645dbd7e7519c0b51920588da16b4cdd7
font_01_sfnt_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 17476 bytes
SHA-256: e3864b77944d45876d5f5fab2b3e10377794cccb8add019886ae90d967cd5b03
font_02_sfnt_off00011b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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