Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2906cab59832de…

MALICIOUS

PDF

91.2 KB Created: 2021-09-15 14:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7cb34c87e0d7ee6e1b87d9c41a21daea SHA-1: 337be7b75b89824cda1e340c47422ea507d3fed2 SHA-256: ae2906cab59832de4eb2c88f51a4a5c25fa6e66ba97c50fb3fcb427cd84c7141
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://allytemp.ru/uplcv?utm_term=jonathan+livingston+seagull+the+complete+edition+pdf PDF link annotation
    • http://medicaldistri.com/ckfinder_files/files/99601273359.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/kunere.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210903034936.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9980bf0ac---29927122847.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/72492276996.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/gojivurujebaxemut.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906063742764064.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/96567221599.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/441165371.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161394c9b80722---8438414816.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210910/file/23122774829.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210905220439.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/xitadefuwivaruzujibon.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/mesavixufesozo.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/juzoxuwarewug.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161414b226d4b4---zubizikug.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/97952612008.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/22556338502.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/dapeferonakuvu.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/gabepa.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/zinikopipikisetivesawela.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/nififopeb.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/tinodewada.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_off0000fa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA22 11124 bytes
SHA-256: fb61294351a90fc507fc74c8f94b73ae9e9b80d0adbd72aa3f28ab845db0976f
font_01_sfnt_off000113bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BC 19520 bytes
SHA-256: 3dd2b6730257ad847d8d8cca3cd39a9273a78c6c2483797df871267005ec3cf7
font_02_sfnt_off00014637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1