Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcde032a7812d5f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 12:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 190f55f99b0ed6caa8dc011fcf1c3391 SHA-1: 617666cb0c1e2bec962564d09b8653859e937b93 SHA-256: cfcde032a7812d5fbd3d4ad261a5316e8011a0b94abe2c29ad0af2c547fa9990
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which are identified as disposable hosting or potentially compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the link farm structure suggests a deceptive purpose, likely to drive traffic or distribute malware. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://encino.ilovepokebar.com/uploads/files/60720531583.pdf In PDF document text
    • http://struttur-arch.it/userfiles/files/65487374243.pdfIn PDF document text
    • http://only-svet.ru/upload/files/jutebilesafilijigina.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/47499528906.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/kuwafenilanumujujiboripo.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/53209806493.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/23478222230.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/raberikagotapebeligi.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/17608703127.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210916204851.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/14295005206.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/sezekefinujaduvuvuke.pdfIn PDF document text
    • https://haidangpc.com/contents/files/felukuxewamawunala.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/dajewamudaduzipun.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/jutozerebuvewewot.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/96065477192.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16135e49f9175b---47357644853.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/93730336189.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d0bfa3ce858501ca11bd07a6a5898526/99749543882.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/42784954520.pdfIn PDF document text
    • https://sterlingsez.com/ckfinder/userfiles/files/gijevedujomisewum.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/21424245208.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/16455009286.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-23/images/files/28317182152.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff937cf26c---21670831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dokkan+battle+friezaPDF 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_off0000b416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB416 15700 bytes
SHA-256: 305960f04fb1cce3c301cd8728e36d03ab30e064e6393efc83989445d54d7cd3
font_01_sfnt_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 10332 bytes
SHA-256: d7ec8e9d663c14f835fb1074c01a34ba5b1f7721088c943e613ea175c3af49a0
font_02_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1