Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c1337fe3fd565a…

MALICIOUS

PDF

73.7 KB Created: 2021-09-08 02:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c4b0441ba5f2a21a43d6a973f42fdede SHA-1: 2cc33b8004dad0794fd73db72337c2e83d6f29fb SHA-256: 55c1337fe3fd565a0ce541de81ecf0dc7ef0efc9f49a4568a593118031fe6997
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 0.9956

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://laborke.ru/uplcv?utm_term=the+wisdom+of+florence+scovel+shinn+pdf PDF link annotation
    • https://1877painters.com/FCKeditor/file/10738317572.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/vinipapisavudepu.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/berap.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/roremukafawesaxudagaz.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/98992078812.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/47148999163.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/df0e63c846e4a5382686fafdc49726f9/lotovotev.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/fokax.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ehnv4lc4lsihu4g015inv7api2/xuvata.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/lasatotodevupejo.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/99424479355.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5dd1a2f42dc78da6e2a2b9a917e9559a/jareta.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/521c36d0ad9c2bbdd831e8654944a071/41601686413.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021080703092273.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0fe3c885ec---18905279740.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/90045415402.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/29044889328.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c535ce437---18799966646.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd31e457b8c---33614458442.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/jakutikazazatagazemog.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4263989497---nizaxazilikof.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/83115759122.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/fumaj.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_off0000bb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0E 17592 bytes
SHA-256: 15b5cc1f5feff51cdf7734944fb593037b1cd33f11a491a93488ee34f64b00e8
font_01_sfnt_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 10740 bytes
SHA-256: 1dd02b2d421fc899015f9a2b782e5253ffef6d880093b670fe5c21b7346be8cc