Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff9bc77c5397ed6…

MALICIOUS

PDF

121.6 KB Created: 2021-07-21 18:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 76c9b9adf0a16087cfa8b5a2ca78b420 SHA-1: 9dbe56e2da87b2c82c99f6358863f389bdaee409 SHA-256: 9ff9bc77c5397ed6dc347654ae5cc4b9a25587090691c2282d1b3a1bb2617cf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to lure users to malicious sites. The presence of multiple external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b587e13e4d---18582335050.pdf In PDF document text
    • https://theatresaucinema.fr/uploads/file/saveluvulolefi.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ead6cf369---80105812855.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/40055046855.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/80092744478.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbd8da8f2a---49125629674.pdfIn PDF document text
    • http://mousike.it/img_ins/files/43027742106.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b85537b58---12215039554.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/30105849930.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b239187960550017eddfb10523969e34/boratijadazitanesoluwa.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429211235255408.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/zuvomonuzinuse.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/a293rr3b9kl0g30du03bbrv26p/67123079435.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/xemepedegadolu.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/wiregavu.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/filexekip.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c5f626653abae9f227580c3b2b004699/99375246504.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/87340396719.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/22135125985.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/xojubolaseja.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/34514962542.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f637a59d81---29750883721.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4564d14e17340e2c9afe28b28ebceb8f/motiwuximu.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/16846886166.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/12407382074.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84199e621a---67191563147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sand+and+sky+quotesPDF 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_off00017c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C3C 10532 bytes
SHA-256: b20cfa3fc4eabe2567a61f66441883d742327939b43567f081b9d8ab439ed476
font_01_sfnt_off00019433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19433 16840 bytes
SHA-256: 4569e9e74383d5f2486be7793624b81a70bf543297e90b09e24284b3cc4a4ab5
font_02_sfnt_off0001bfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1