Malicious PDF — malware analysis report

Static analysis result for SHA-256 9303853df3e83334…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 01:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ab07acd7c2fa93ff4b22db5b73667ef SHA-1: 52eb93508fd8d763813fadd967e436ca52e15703 SHA-256: 9303853df3e83334ef52dbfe10f6c1fd22eb50fec10c54eb58a5205b08e1bb1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised WordPress sites. The primary attack pattern observed is the use of these links to direct users to potentially malicious content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+in+english PDF link annotation
    • http://slhs1958.com/clients/18590/File/wofubabowoxipunizexewov.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/pojofawozevedewil.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/56453619877.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/33767126287.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/sovefime.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zoxavaziwibiv.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb962004d---34814786235.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb471195a20---nezunuxufipobusokaxobu.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6d969369aff582a1e60401cbf39c648e/kezowuresalazel.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b308fd91---tifipedirelemepi.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/40847855495.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zopejozubilapuleragarubel.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/zezef.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16095cebcbf6bf---vakilogasezig.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a7c9021958d83c1b47817e87baedd1fb/83132971162.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c73c375ad---58999154610.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/85574425041.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210624211659_mfm2u9.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b7938736c16b05b320702c70db70f886/34571532690.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/25449419387.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adcf20c7204---xijiwowatorugulamop.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b24ae2ea---34988539318.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/koxojukamomigadefuk.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/15333824184.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080783d90a34---jemajuxatarinuraz.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_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 17660 bytes
SHA-256: 905d007677db491dbd10c8cfbb10628be366f274ec16721ea2c51806e7535b61
font_01_sfnt_off00011bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13413 10812 bytes
SHA-256: 1160f9f083c598937cd5374356ca0f8266cd56ad8228bb1a5e64a160077dd8fa

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