Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1ee1e92c1d38e8…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 11:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2f2e9c2c636a9ff76c5a8e1b6f05fcb SHA-1: 44cb0401d2be48f585f5f5dc44f314296a0ff0d5 SHA-256: 8e1ee1e92c1d38e82a14377e3308d467af22e90a959929799f1ffe3e0a4ea1d8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised or suspicious domains reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://globalybm.com/ckfinder/userfiles/files/1631114132.pdf In PDF document text
    • http://orosweb.hu/userfiles/file/86647592166.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c792eb03fb---doxubora.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/79719334627.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/molovimafezosokuse.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/52915944725.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613118511a482---vuwijuzo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132299c78af7---xajajumakizowo.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/90832691064.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/98249160629.pdfIn PDF document text
    • http://gr-chem.com/upload/files/4129213723.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/48226517736.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/84886130365.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630548988/files/24940992873.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/31334826106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=singam+123+movie+downloadPDF 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_off0000c386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC386 19536 bytes
SHA-256: f2e5b61a1bf9d42e74836987fce9c3bf56cf1a73a6ed738451fbb09c00fe5305
font_01_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED8 10796 bytes
SHA-256: d2c031544d713ab21a829471d04678b9d4e7b0ae467a8b2a15f652dffd628bc2

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