Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a400cf70f32f05…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 15:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 94217b2dcbe21a2ceb5b21e3af461135 SHA-1: 5f05777f612bf8e1be681ac7dce08286dd0bdbae SHA-256: a2a400cf70f32f0524f88083a5bc9df8fb3fa20c2ee3c3ead1f0d245fe833597
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://stroykap.com/application/views/stroykap/userfiles/file/2670129316.pdf In PDF document text
    • http://fkjz.cn/upload/files/2021/08/202108090547595522.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/depenikugaxozuzixutirim.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/letevuxizazigani.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2d7f40be7---siduzur.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d434746117---76040838721.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba640c3826d---80067375270.pdfIn PDF document text
    • http://www.grifin.sk/files/81229998112.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/mowozotide.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093decf9ca6f---63194635055.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/cabf6facb37225da765e25ecedbee851/nufivugonarupuji.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/rasazupusedan.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/afpbvgpp4sf4cq8k6qpp7nduau/tivadavisoxu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be337b812c2---58840698523.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/089101c1d5c49be24052c529d5992475/87140764509.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/fc46835e571a28b1487a905cdc668b2f/zululuvo.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/26239492804.pdfIn PDF document text
    • http://kleiberit.ru/files/file/nuxetev.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/37369311201.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/20852755711.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce351d3916---walununozepomal.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/danijufowuzetazo.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/db5ac5cdb6cddba6dc9ace1d6623fccb/39292534335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=igcse+o+level+economics+notes+pdfPDF 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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 17444 bytes
SHA-256: 8e53de6eb6d98dc884fe18e003bc0ee9ea99121b5dbb2f07e4579773bc53251a
font_01_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 10716 bytes
SHA-256: d2fedcb2f2b9748d2b76ccc459de94e0492dce668091efe9c33ea50290c03174
font_02_sfnt_off00012a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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