Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b1069642b11a47…

MALICIOUS

PDF

87.1 KB Created: 2021-10-04 20:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 29c4b519cfd47840491279a1b4b17897 SHA-1: d613de1717b8cad19f02403f5e01a456e237b72b SHA-256: 21b1069642b11a478c82044cf1f06d85bc88491ea425d32f2e44edb4ba243f12
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 flagged as part of a link farm on disposable hosting or potentially compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings and URL analysis point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infoegrafica.com/userfiles/files/tinodarisaxomasivitojami.pdf In PDF document text
    • http://nb-magnet.com/upload/files/mosumojedoxovivinazufex.pdfIn PDF document text
    • http://online-cycling.com/files/file/74487896100.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/36025067016.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/6610316168.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1615999868abcf---tomolen.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/fomapopatebemirokojalu.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/zazirawibor.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/pafewamavuta.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/26977976938.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/fesipolidugoledawivit.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/2ilvvlte1ks1a42qv4322fk14t/35558186896.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bb0d97bef---xubitatujafumawobalodulu.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/dulatuxidisudogedi.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/69722232559.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615039a3c1189---62413962.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/jojepekuzuf.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/gemobiraf.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/kozozir.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/repov.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/tazitupebumoxewepojugojeg.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lebojipafome.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/lobifis.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/tofafemogaxe.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-10-1/20211001160057521831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=another+name+for+team+leaderPDF 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_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 19020 bytes
SHA-256: 0d3916935fb7fa687dabf176568ff24ade8a7bb1784dbed5897efad3025e6f1e
font_01_sfnt_off00011f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001374d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374D 10340 bytes
SHA-256: 48cc5fe5754e00a9632d988ab306cf2b6f721aa00b8fb3158e62b41502a39357

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