Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb474945e9086e5…

MALICIOUS

PDF

109.7 KB Created: 2021-09-01 17:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 42eeaf427622dc6b151eb2018fb918de SHA-1: 3ddddba15f144d8310f2b7fede8b425430bd8d9f SHA-256: 5cb474945e9086e57faaf08d448b053e1c647621c29af7d5db894839b1645ffe
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 0.9985

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://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/nasekutejekepox.pdf In PDF document text
    • http://midel.me/userfiles/file/gixonekumujumojexifo.pdfIn PDF document text
    • https://paperland.bg/uploads/file/lelukunosodixegeb.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/85923028359.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967b1bed4a1---58714613984.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/85355430322.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/8c421c5a254a0e9e9375f9412b8a08b9/24530221191.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b63e2e33823---timorusudebopaxomurutom.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075db21479fa---77394062431.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/44343405933.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4f0768b091a36ef411695a49d433022d/gapufobajikegonenurevo.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/turebiluxolugepilokor.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/noxalizofusebu.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/gopanogapabigeruxemenib.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd8283eb9d---98887789469.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202108031433549536.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210630133239751983be5mn.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160edab8a49d5a---xapebamemibujidewava.pdfIn PDF document text
    • http://soupworld.de/upload/file/3112836320.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac675522602---54006071486.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/todalidinaruxunawi.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/607795bd15dd0eeb777bc9ccf1837c3c/ledalimukomarako.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/18264884473.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/20679827930.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/65048921402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=principles+of+accounting+10th+edition+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_off0001424c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424C 11172 bytes
SHA-256: b10eb4d6361e3e01894bbe9d53be34f357256962487481fd6b32ff0ebb1c6a03
font_01_sfnt_off00015c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C25 19988 bytes
SHA-256: 2abdfdbdc13df0f6744d528b2ac3a6e28a9ae310c448a66a18c8878b0179eec4
font_02_sfnt_off00019017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1