Malicious PDF — malware analysis report

Static analysis result for SHA-256 33288cb8ccae7b4c…

MALICIOUS

PDF

96.2 KB Created: 2021-09-05 19:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0264dc41f862729a2d761f14cd117197 SHA-1: da70898c41b6adbf4a05c0a821959993daae8bd8 SHA-256: 33288cb8ccae7b4c0611189d42500aab95ee84f1e009b86dcc2cb0c27422fa11
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://roomyab.ir/basefile/roomyabir/files/54590822205.pdf In PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/tabeje.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/61011340595.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ba1d16e3a95e8d68ee0fda27a27ab70b/rawodavujibanibudemanuret.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/97815311334.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/17546606459.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/28792149591.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a7b5682ee8---42187427929.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c71e63e79c8---bewem.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/84235329974.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/83754640296.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/gibidaloloxi.pdfIn PDF document text
    • https://penal-garazh.ru/files/jaselizuzup.pdfIn PDF document text
    • https://toocapen.com/files/18969126117.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/pugogujomumonawipamadu.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/litabajewuxeda.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/lomaxuzurezeluwabuxumumuv.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58a215267---bewitati.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/jodigesikipuderababaw.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/45a2f210e6aea6c23582d01261d655e7/vovakamosanufuvilidujori.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/25987382327.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/88454164588.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210726013038.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/54703462419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=french+verb+tenses+chart+pdfPDF 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_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001200e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 23036 bytes
SHA-256: 948ef9ec9d19d315c387bad657ba58cf6d7781a9e9feb36bd3b54fa809806138
font_02_sfnt_off00015ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD3 10644 bytes
SHA-256: 02d21f1d835de2515a80a6dd7f496004f33b0ee568e50a4e7a65da55d8c7fa3d

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