Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c6d096af15864b…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 09:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75f5341e4ac759ecf355041dc35dd244 SHA-1: 925d6d407187e549c0949a790f269b4001c2fa6f SHA-256: 53c6d096af15864bbee7c043634b5a21a52ae7c7cf97595a21968efb290fa9e9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking human-readable content that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb623a851c---povipazimiwofabi.pdf In PDF document text
    • http://vvk-wiedermann.at/userfiles/file/xoxelikizeresupi.pdfIn PDF document text
    • https://loctra.net/userfiles/file/52174625468.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/8234167944.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/83365506274.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/kifapomazazoniwofanesi.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/95859277114.pdfIn PDF document text
    • http://temple.mo/userfiles/file/lexuxoverujeruduxod.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f4bba9c652e9106233b49cb82b401cd1/mewibavutijexeruvejakug.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/difefevidomagakir.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f3d1d5457ca817e97b388c5dddc46082/zabegife.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/lv6atemf96989k6n4uvcial3lk/18069732026.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f94642777ded30363df1db688bfc580f/96885170749.pdfIn PDF document text
    • http://dges.in/userfiles/file/lokasoziselunugatoxividij.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf5e4d41d---wunolemenupanukapat.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/kobolavadazofakefoxobotev.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/magulapetojuta.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/33218422849.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210704_055617.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ot2ftu8vlahi87p89oc7g8pom3/43990558227.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/domipozalamuvugi.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/sobizipakufumiwawok.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/44ec12e8a1ab363d493f79bc98e3a8ab/59629605509.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/623d129786d30690b0d6ee5422a7ea9b/51746435545.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/tijurawidusupusala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=watch+the+death+cure+online+freePDF 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_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 18016 bytes
SHA-256: 24e0316280ee65330bd1d4c847876316da7be27ecc6f2a01c5fb48a7ffff51dd
font_02_sfnt_off0001358e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358E 10500 bytes
SHA-256: 64148c08a3f23467a957641d9f3da72db51bbab3c65ee9292f0fdded47e59593