Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3a33fe4a150a7e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-23 01:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93a2bdc24f7982e3281a0a299beea54a SHA-1: 94aa45104bca39d65721656b1cecacc1fee59f3b SHA-256: 8b3a33fe4a150a7e2f8af13ea340811f14a9af313db8e83f06d19ad7d887e714
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of these link farms and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161314771d4673---lijibis.pdf In PDF document text
    • http://folientastaturen.pl/_data/file/76408624748.pdfIn PDF document text
    • http://goldmustang.ru/files/files/navaxibamijazexe.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210922201250327.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/25678662581.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/71142322399.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480cdaf1301---rotokuwuzovijomosetosufox.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/xolere.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/98910011559.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/pivof.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/2379778151.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/91166648573.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/42250529128.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/womobemixaki.pdfIn PDF document text
    • http://short-story.ru/upload/file/48707957468.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/78276746090.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/niluxejemegezalud.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f27a7d07f---53699494980.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5cc81224c---porubagafaregiguwoga.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/vokotoragusifevi.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/28532048678.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/firejimufak.pdfIn PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/33900789540.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/40418514650.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/wibenulalomowabaminuzeku.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/28239690656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=offline+game+terbaikPDF 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_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 17168 bytes
SHA-256: eca4dedde50828b6cc53c641fe8946d332167e0808d6ab5b0d809f9273dc328f
font_02_sfnt_off000138dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DC 10524 bytes
SHA-256: cd0b8315f09750e53438697f0554dc69d2363a1c84b2145ac8c0128a4a5c41a1

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