Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25b2e592785bca2…

MALICIOUS

PDF

73.2 KB Created: 2021-09-10 13:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: edda7e7c77d6d54b27b78d5dc322c95d SHA-1: a2328c452ac2ec8bc9a25b38716f1301efab45fb SHA-256: a25b2e592785bca2fdb12e7b88a2fb74672aa060aa77c9ba7d7dca2d9a560f5d
164 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to external URLs, which are often used in phishing campaigns to lure victims into downloading further malicious content or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sistemagestiondpr.co/userfiles/file/nolujifuropitigonusaw.pdf In PDF document text
    • http://lapawan15.com/shop/fck_file/file/79130389667.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135707a0cfa8---tumikozuxogupu.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/40553887107.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/13916298537.pdfIn PDF document text
    • http://www.agot.pl/upload/file/xelofuwujijonakepa.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/wulasisidemabowubineraxu.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/mosoronulen.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/vigafobigapo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7f165e04---lanomiwapemuxinojelikeme.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/52261765026.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/29409334674.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e757d9a89---bulufefosideduxijumu.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/36968390135.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109046321_239730017.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/pafefisipa.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/53627236166.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/62401650554.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/15128772282.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109020620436251.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/3878604810.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/dufasetakebamixipojino.pdfIn PDF document text
    • https://birudongker.com/contents/files/37764703799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=husband+wife+shayariPDF 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_off0000ba42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA42 17372 bytes
SHA-256: 5310e4b58572ca6930af0fdfae0281206efe390f7f957ac1ffb45c37c5a2e62b
font_01_sfnt_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 10620 bytes
SHA-256: 020a0cb060d22ed8d778fb75da31a47c0f6f192d388d408fe14a52baaf638e91
font_02_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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