Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e1df8c5e60c2f4…

MALICIOUS

PDF

79.3 KB Created: 2021-09-24 01:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80f8cb459bd6a2b8b2cc72f337ab7464 SHA-1: b047bab9697d7429a907316691dd800b174409f1 SHA-256: c6e1df8c5e60c2f42b308683059f0f5ba04e884be09316778c96f6604fb08176
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using these links for SEO poisoning or to direct users to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb5f3246d---10461502040.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415bee4a0a3---20339483052.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/wuparika.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/2099579348.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/wugopodabekajesizezixu.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/xadepulikujobunosedot.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/xarufemute.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/46692118037.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/88260207675.pdfIn PDF document text
    • http://yachts-trade.com/files/26281363523.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/wekefe.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/losoguwodudasenalimozalap.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/ripexawaxupubimut.pdfIn PDF document text
    • http://exosushi.com/uploads/files/wunutufunitajuxavomaxi.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d7f01a3b---54608196662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=redmi+note+10+pro+max+vsPDF 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_off0000d01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01E 10896 bytes
SHA-256: d50eb9d99f48f22af0620e51ad867e840928f121f10683a4ac528a0fe558ca82
font_01_sfnt_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 17888 bytes
SHA-256: 7ca2a32997662348b05c6938c0f429ccea6b7e089ed6f8c15952d02e11ffaf76
font_02_sfnt_off000118a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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