Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7141858a9f1d540…

MALICIOUS

PDF

76.0 KB Created: 2021-09-20 04:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc2adb90bb8c0b25b7a1cbd6f2c1863f SHA-1: b9e0c063b543309990add7296d04288679972f82 SHA-256: d7141858a9f1d540980732e339c37dafd48bb16cce942aadf0006f12bab2cb26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://banglenhospital.com/UserFiles/File/sijiri.pdf In PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/tabones.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7c4e1a5a5---pelop.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/zutexononakojilo.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/33386383076.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210903134808.pdfIn PDF document text
    • http://spharma.ua/files/file/87403240465.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210912235844.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/71741178577.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07d316eb5---60154358889.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/xeref.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/61243554302.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/66380192047.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/77266346028.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/80334193921.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/46021749689.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130095fbd4ac---kijolopudepog.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/vafabapeliluxa.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/letozuzojetekejoresadanox.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/79666719202.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142ae1dd66f9---renemorefirolabusawam.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/babapanazipozodofij.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/72150277443.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/87271113938.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vobawodatuko.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f270def34---28061562913.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/35152862126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ig+views+premium+apkPDF 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_off0000c2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D0 18324 bytes
SHA-256: 363927025f732e613416b26c7737d5cf14f78e55b79c78f237a1f296ff22b503
font_01_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 10520 bytes
SHA-256: eab188bfc08dc777fc761e0e3ed489290add9ee857f3a8534f62eb3ae23a3aa9
font_02_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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