Malicious PDF — malware analysis report

Static analysis result for SHA-256 833ff75d8f5e875d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 21:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4481d50035609cfc7f489a8eb91c7157 SHA-1: 86d483a3aafa173e96cb8675e1db67b22e33fbda SHA-256: 833ff75d8f5e875d37d108bfe755ce29a150bf8f567605442e8dce4cfad9c7e3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://fentesmakina.com/paket/upload/files/wipekodumuwe.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3421122c7---fajuluvogexodebo.pdfIn PDF document text
    • http://usmleworkout.com/files/file/56299537282.pdfIn PDF document text
    • http://e-district.org/userfiles/file/gajeketawigadok.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/28573860182.pdfPDF link annotation
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3529131eb---28177049221.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/38879895294.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/38280057942.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/18099759292.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///11550139445.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/88205373822.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1418603ad---tezewodipovef.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/96959007784.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/41453375685.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/vesitojipepibufiribar.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/78961532153.pdfIn PDF document text
    • http://bienbao.org/uploads/files/71466978073.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/torifetumurof.pdfIn PDF document text
    • https://jagominum.com/contents/files/55444234784.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/kekuzilevutef.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/jisavewosa.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/88464021087.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/74012669387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=new+pok%C3%A9mon+snap+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_off0000d277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD277 19072 bytes
SHA-256: 8c6d2110f2a619808bc774842268a4b8b33f1f609a71ba5196a78ad62b3f26e6
font_01_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C91 10384 bytes
SHA-256: 7b6e4737aeb218ffd3455b6a75145364f3f1fd9534cc7fc1387cd8d0fe9c1710

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