Malicious PDF — malware analysis report

Static analysis result for SHA-256 d528d8e818139068…

MALICIOUS

PDF

99.6 KB Created: 2021-07-23 12:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a4504e298f2a1faed3dbffc0820b591d SHA-1: ee938a1e4502629e9e51b15304a34b180f8f8268 SHA-256: d528d8e8181390687d7831b9948ccffde839c956471e848cbf9fdc68da0fbdcc
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8fe813994---wijatakenilijekij.pdf In PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/34028114736.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/21190271960.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/zepalomaluliwu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50b80e7a1---72533091839.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/09p7dgc7gc0d5ao8h898v81voi/66700247650.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55d024e60c---93599959584.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160aba92febb39---zaruki.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/pososamiwuxedojiporunaja.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/vimudafexuminofu.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/5392747003.pdfIn PDF document text
    • https://tepihtrava.rs//files/nujab.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/dilawozuvababaju.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbeb902ca0---bakarozub.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tvm2fs70ldd6m674dohb01lrs4/3319451221.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea33bffcb180c53960d0523a54071803/7279256223.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/12244668682.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/99ffabcb9c5ff25552ed773acf51940b/rumikiwapilejovanoze.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/mugozanorenikanesumibud.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160f7abe1a6028---82333551219.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1fc8c781e7e4ba324b61b4e8b351cf5f/kosobige.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/bepir.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7hanj39dqsp9mbsju6ua58oiiv/94844471240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=coconut+frosting+without+coconut+milkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 18356 bytes
SHA-256: c7b7b013e97e5b7e072deaccf9245fdfd82abd773f55888a7f74d8d216792fbe
font_01_sfnt_off000139f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001520c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520C 10800 bytes
SHA-256: 0a6c8b1cef6f310262b3ced88e6375d35cd837c54d2ccccf0e3197af0ec3cf5c
font_03_sfnt_off00016ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC8 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

Open this report in the interactive analyzer, or submit your own file for analysis.