Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd319eeba1bc420…

MALICIOUS

PDF

99.1 KB Created: 2021-07-30 05:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c9a29a39ff6b93fe2cc7b2cd364859ce SHA-1: 01dfab876325483c0b56b838868c638d6700078d SHA-256: ffd319eeba1bc4201ed6951258392c53e1311c1606503f61d27c84d21dff6083
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a significant number pointing to a compromised WordPress site, indicating a link farm or content hosting strategy. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864e1c34e04---nasovaxiweb.pdf In PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/62817726561.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/937a69377b171e1fbaf58c92a9041d0c/setikowalogesupesidezuje.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/e7f730c43f0030ae7c2ce4d811134931/soradomurixopi.pdfIn PDF document text
    • https://digireg.cz/upload/90778465380.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/nizimevisut.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78dfb17084ab13a1c47291613c25c865/tatuxitu.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f3838d7c4a1---zezalolifanemovakirusep.pdfIn PDF document text
    • http://allycatering.com/userfiles/nowadumenav.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/89050517449.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071304503980554.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/c7d05e5bd9584258eebfe0b18f73b4fe/27885008179.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/55786827111.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/vasixefidi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d072739c24---58747293559.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/mujavabiwe.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc3b73275b---88776635843.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb0cc21870---mekarumelopig.pdfIn PDF document text
    • http://ruresept.ru/files/file/femusurozarumatufusemini.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/28036042549.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/dazerofojegejopovanaweg.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/rapififawisifa.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81f78d68d---sowofezifipapevogibija.pdfIn PDF document text
    • https://aspirans.com/files/file/37000000090.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/tikuwimexipawilulale.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/nirefaxetabumulubinadak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dise%C3%B1o+de+colector+solar+plano+pdfPDF 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_off00011b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 18444 bytes
SHA-256: d8003cccaefc1ea00426308d99fb841cdb5ebf45078f94e755de0058cc2b2f73
font_01_sfnt_off00014aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEC 10820 bytes
SHA-256: 5f0dc9739365dfb4dea2fca2518e1d545110fcf8449516d3b4290bb5d4c5933f
font_02_sfnt_off000163bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1