Malicious PDF — malware analysis report

Static analysis result for SHA-256 f647e405acda8130…

MALICIOUS

PDF

87.5 KB Created: 2021-07-17 01:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3efc26892c087856440c9d17afcaf9e0 SHA-1: 23d7abd19b1ac0e76c1aa22d3f885b8a52ea702d SHA-256: f647e405acda8130fd3e39266279ee0a8490c4990e452ebcde02c87d3723485d
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. These URLs are structured as a link farm, suggesting an attempt to lure users to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the interpretation of this document as a malicious link distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/cq8thp40477kju99970m1rmn14/72310561524.pdf In PDF document text
    • http://jevades.com/aircraft/fckimages/file/leberajobu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894e8798119---73018862958.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/67121101079.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/fusadeguv.pdfIn PDF document text
    • http://scpt.it/userfiles/files/tebodisinol.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/43690397458.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/ripajimineliwurove.pdfIn PDF document text
    • http://fittbike.hu/files/file/15434442179.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/63760996785.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/kanozovis.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d89a60c645a717b329a5dd42c5c083f0/sodifizoduvofinebodekizuj.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/31191393630.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca883a7e7---2821570739.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/febomanunap.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/4258348982.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/kamemuzumizilezava.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/orila064he5rgdq1tc151iq7op/79627009713.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/xugebafafut.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/81047157842.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/a8fb0f6b4bc847b9f725dacbeb392278/miwalixakisiju.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107170702044400.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c90739cb3de---molomemidizolirozonuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+a+persuasive+letterPDF 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_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 17108 bytes
SHA-256: 2067243b08a104f64457fa563c5c33b8c20be8939a4813d1bdafeb96e46ce163
font_01_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 10644 bytes
SHA-256: 377a1fb7c0a16312567d5ab396501367bb28551e259194e40f1bf70571b6f6ff
font_02_sfnt_off000138fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1