Malicious PDF — malware analysis report

Static analysis result for SHA-256 49505ecc9135dba4…

MALICIOUS

PDF

85.3 KB Created: 2021-08-16 01:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4d18a20900cc1b4cab0d615a9c482f09 SHA-1: b9ce51ecb7c9e235517db8bbb35f9bcd956370e7 SHA-256: 49505ecc9135dba49f73699b9d34d04673951773e95211fa2283c2e059fd7163
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://qhchemicalsfeed.com/upload/files/12434540317.pdf In PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/nikum.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/3497402972.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d035a2db---dizosuseda.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/lufimozifob.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/28054372792.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d284e9db2e8---21780057631.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/38757303214.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/42a539245a087e3503df0e042e0680ee/mivapawezosux.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/85963156297.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/52307036040.pdfIn PDF document text
    • https://robertbah.si/files/file/xajokapopifuwitimoxafem.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/wevofuko.pdfIn PDF document text
    • https://icbacademy.com/upload/files/jedipogogavulurosetapine.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/zudisexunar.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/5ctoi9utvtf5ckvb8ehk3uou9f/94649213459.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/fobejeku.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/69645751208.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e5e4a3eb27afe35de9b952b44d6f9903/zulavixajerutefiwebase.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/22303566022.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/83310700821.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607554df4d32c---zivepafofab.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c976e5d6053---35230215453.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/zipexuxadusobojaratex.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/2846912789.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/gevikutit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bloons+td+battles+online+hackedPDF 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_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 17360 bytes
SHA-256: ac261f575288fc91921fd3f6362898acb1699a021b4f33f4fe3afbc3ce4810b4
font_01_sfnt_off000116aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AA 10652 bytes
SHA-256: a1fbfa9177bdf70d1f0d7f88eeebc9c2a6f686e8729a4ececf2d5f9487ba9d74
font_02_sfnt_off00012f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1