Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee461d18d7fe8490…

MALICIOUS

PDF

75.3 KB Created: 2021-09-14 06:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 038a7c46a48596cbffad569d367f2292 SHA-1: 0e1115f5eeb3b106fe9e45972f389c149b224b50 SHA-256: ee461d18d7fe849082023dfe58612ca407cad9d22f670b48e0cc26c2f80f8021
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://ketchas.ru/uplcv?utm_term=hello+neighbor+hide+and+seek+android+download+apk PDF link annotation
    • http://paillasse.hu/userfiles/file/66047886280.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05a77564f---76559066478.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/kukonadosiluvinavidokewu.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/u9emmk5bf8k3h5s01kq9t9fq6i/majizejilu.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/96234173533.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210906_163618.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/32678930956.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/22471704706.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/kumilibonomug.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df2b43fd17---57611538938.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/30884175017.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/24950849071.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/58458264025.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613994003ff52---72917918777.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/93242198550.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/67397065096.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/38397975122.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/57669056301.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/138420e95a398b3dd722d752cd8fbd10/wirodamukulonuzoseneraga.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132079911303---43810254471.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-8/20210908060605800464.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/tuwikagapirivig.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/padogudiwaj.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_off0000bdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCE 18468 bytes
SHA-256: c90bdc9e7a070a8ad1fbd6cff789f8b12385143a920846312dc77ccbd1535c5c
font_01_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 10884 bytes
SHA-256: a9aadb833e3765f2d3f6340f01245269d74d65c3203eaac5ae8813f3c423905f

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