Malicious PDF — malware analysis report

Static analysis result for SHA-256 505afdcfd084631a…

MALICIOUS

PDF

78.0 KB Created: 2021-06-25 23:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 957859d59dd19cd072e232cb6385d61a SHA-1: 037b0035809fa3cfdfd8e369eaba6a51e31bc0d0 SHA-256: 505afdcfd084631ac8a519a889f242aba21195e4b9e0a5228a9e31e2eedf4258
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for containing a link farm on disposable hosting, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=only+reminds+me+of+you PDF link annotation
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/3547092067.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8759e8c078---bowuzebavupefoxo.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/s0ksl1tuscevak5eth6n1cb7kv/fodamokib.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe840aa09f---nexigav.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609277b563c2e---duravuzebojikim.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a457b22b112---pupumarimapipidanel.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/34701922299.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160883b151c944---vunanobisozojijuj.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/46378332348.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e4cd08bb7fa824b5152b77371d0bd8b1/xotabopamaxa.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608db835177db---rewadano.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/wunijesivisenezabigemij.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ad0436fb4c05baadf3d4aaaa8307d3c3/zijoputirewekebufuw.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/kujegaguzapu.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/80220802183.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/32015480356.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/73303210392.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b918c6d300b9e97981a14afba3b6f160/5118702509.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/51331501771.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kenatokusawoxuraxak.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/14856920478.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8dae2ab1---27132447171.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_off0000ca12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA12 18924 bytes
SHA-256: a323e8bb45c5b0772b8de4fe2e3ff6631fe7979a211ff32303ed219421b00167
font_01_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 10492 bytes
SHA-256: 0b08907b41af00fbffa249b3c6cd6fed89fa5c0010143c8f0617bddfa363a508

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