Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c955b10073398f0…

MALICIOUS

PDF

93.0 KB Created: 2021-08-01 09:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff7260bcafeee1a4b65c144255d02b0d SHA-1: 257cfbbb07112623eff5f8677d259d9b74b34bf4 SHA-256: 2c955b10073398f0e5878ea62fba0d3d590231dc3b4af7d684beabcba3960198
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites. One such URL is http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac592a02edf---danukebojedowekadudam.pdf, which is likely a lure to a phishing or malware distribution page. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/u6rp9mbrnek5js0nmmt33djv06/jumanofuviripeti.pdf In PDF document text
    • http://hanabi-la.com/uploads/files/64079211159.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/5nj4gohqorddujcaokldqko0tn/gebajukotunukuburag.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/iom9k8d4g1fate66ka153kodeb/senuzakatetuvakube.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/nonijinu.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/zozadenilavos.pdfIn PDF document text
    • http://alcantara.cz/data/file/larakamofexadigofuzenezi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e2b555ae1---tipavi.pdfIn PDF document text
    • https://inncredel.com/uploads/pipawowunudegibowuvuj.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac592a02edf---danukebojedowekadudam.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fbced5aee---luwesanupagavuxifegetikok.pdfIn PDF document text
    • http://landia-print.com/pdir/file/30694855694.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/nakipibobeponafixu.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0426878d6---dupuzabakobamogozumer.pdfIn PDF document text
    • https://airshow-bg.com/file/17902479587.pdfIn PDF document text
    • http://rayanchem.com/d/files/84317948478.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/katufupone.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b656c9db74a---wawosafizudozel.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/98549456520.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/1119fb9761adceab43dde52fdf4e017d/joxar.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/pizadopasimofivivar.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/e5a5a75ac5c42c4b96cfbdde6b46e211/polerixusuxigimevorobe.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/78f06f1a8cfde5092886bf042325d112/25455805933.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/07c2d6cd3114f5e7738f4f74396ac5a5/99486234163.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/pikewavonopamajakafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=calligraphy+practice+sheets+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 17976 bytes
SHA-256: 77f437beb2063d308b0ab1629c7d580a09e0ac4262ae8228fd7bb11b1ff68569
font_01_sfnt_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 11132 bytes
SHA-256: 2241a9b3af6621b91675d3175afa82948a65a233a8b9402c322537daad579d9e
font_02_sfnt_off0001378f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA0 16188 bytes
SHA-256: ece2270c45c55b97aaaf5c9ec5d0aaca517253cb37572f5f454bef2040e8a275