Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4a90231a9643e8…

MALICIOUS

PDF

119.6 KB Created: 2021-05-25 13:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 079489bf13198373032fcc7c34b62d3a SHA-1: 5f97858b228f559229a576f9a710f16d2699857c SHA-256: 6a4a90231a9643e8c3f569d4ab880ac6dc9290dd2e656458d6e4a15de1fd3d71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a740f143fc4---sawatefepavufinewikos.pdf In PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/tc9b6e97jp76u6upgi6g1224f4/tozerifelojaxalilaro.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/zevutakixesagozalage.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/befba43826bb2b64a0f402c5e8a3051c/58414332217.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/51678816271.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/21989368922.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7600d8e66b7f9ba90268c164ba268372/69491924938.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0aa8c5035---60835700792.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a88b404a8d34639a9e6b2f0e3387385a/vudesexufikufonuruza.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b051da164---80319730115.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/98e7ed6a59b366ddf0c0e0651f6dff85/79497891953.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fcfcd0df6---savobapadeje.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733179dbd82---54515040362.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=transformers+age+of+extinction+movie+posterPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18960 3540 bytes
SHA-256: db13decb2f8c5ac9d407be2b3e6057c01de58c6eb285ac6324e9f3dbf4cf3a7e
font_01_sfnt_off000195fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195FE 5380 bytes
SHA-256: abc957abbeb33a68e95f2223c688a62e6c57d4b77772c2f09faf8f8dea3c5609
font_02_sfnt_off0001a847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A847 11904 bytes
SHA-256: cd3123f113f9c72befac99bb5b853aaedb2f2227eab0c702f2a44fa98637425f