Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9c858b1daeb320…

MALICIOUS

PDF

87.0 KB Created: 2021-09-01 23:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6fb8d31a3d9dd0b2f0ec7bd02c5d37f3 SHA-1: 51778f12aedd43cb770ab680ad2f383a79b30290 SHA-256: 9e9c858b1daeb3208fbd6c1ba3fae7d022e1ff267ad4278aa195785fc6bdc345
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are commonly used for phishing or distributing further malware. The presence of embedded JavaScript, though not directly analyzed here, further supports its role as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://xn--rssx31a7tec6p.com/upload/userfiles/files/20210828184806.pdf In PDF document text
    • https://hasekei.jp/userfiles/file/77181163616.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611221957a495---gaxoru.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/88181689462.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105ff822327e---zupilusiwa.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b698323e1a7fb43243b029012368b6c5/24442773849.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed2710bf65---kipenezosamavugej.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/7339155629.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/81143412704.pdfIn PDF document text
    • http://grabnerestriche.at/50381324534.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/36768000085.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uefqoka1ir5qmskl222ah7euv6/mafonusajog.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a8f60f16cf5d9c8b42bd086f955f58d7/muxuzalagajafiwoz.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/35867695276.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b11c71c19---70675998194.pdfIn PDF document text
    • http://pb-book.com/user_file/file/6295872909.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/77416905021.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/968557d4954a4e1082712bd74940013c/sosatoloxivabukegezis.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b0e09e20---58379549830.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/gc5lbvbi70f1dqi4pd5mgaalc2/23746273262.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc26cb2e96---31476067307.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/59134841413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gasoline+station+near+me+nowPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/javil.pdfIn PDF document text
    • 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_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 18140 bytes
SHA-256: cef87fd71420cd6a6976f59e3aabc29bb0576ccc6c3bb96e50d54fbe54e9ab01
font_02_sfnt_off0001369b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369B 10396 bytes
SHA-256: 3bedaf2921463cd35a0fd93ff0ed95b30d2913df45decc8c22dd4930c10c8d6f

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