Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa31953d01d62fe…

MALICIOUS

PDF

155.6 KB Created: 2021-09-03 18:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63a7227c5de269b475b17465f3a0bcf5 SHA-1: c1619202ea310264fa247035b1ee9203078741e5 SHA-256: 9fa31953d01d62fe3724a9c5abadd5f7ffb7e3a53c63fc00d2f1f3c56ffa85f8
96 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised CMS installations or disposable hosting. The ML classifier strongly indicates maliciousness, and the link farm behavior suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

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 http://chieusangducphat.com/uploads/userfiles/file/68529812732.pdf In PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/fbdeece5919e797cfd528abaff13bb2d/romabumerujujoxanataso.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/nolimobaxosazebavunopiwo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc2cfa1e67---wisus.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/11397616361.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/c0plekvh6sdogoasu1kfuj3o6l/vafenezinure.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071399a0cc62---kivoxabijerapufaxuwona.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/vetukewolijuduguzi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076558795084---tufikipevulapin.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/jukuwinunarulabireg.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6c9ad8bafef67075de4de368119463b6/45330491953.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/73812532005.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a0cef14f38b---13458681140.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc14489ce31---57027735499.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc47f56e66---99507017177.pdfIn PDF document text
    • https://cian.hr/userfiles/file/garin.pdfIn PDF document text
    • http://ippon.lv/uploads/File/97980351058.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/400fdd9a1f5259ce5ca6d2f06eecb9f4/judivujen.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/kes2r7brd1kbp95vv3grpq2u0a/51114104233.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/96695895648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=buku+pendidikan+pancasila+perguruan+tinggi+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_off00020043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20043 10920 bytes
SHA-256: e588b23de7ba452912d9535eecd0c9cabf65fe3a96487371fac236b65862004a
font_01_sfnt_off0002197c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2197C 17848 bytes
SHA-256: 7b36b6f38138549955f96e0bfd137722b026f5e5e853f1aab670948a9e19f95c
font_02_sfnt_off000247eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x247EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.