Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbf7348cfec513d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-01 00:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51217441887b9e5e272d9824f11fce8c SHA-1: 3bb4f2aeafd71bf3dd559a7906a8bcebaa04167c SHA-256: 5bbf7348cfec513df7756058816e1de26c4a513060b4c670dd4836bdf598ff88
96 Risk Score

Malware Insights

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

The PDF document contains a link farm, directing users to numerous external URLs. Several of these URLs point to compromised CMS upload storage, indicating a potential distribution point for malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sjar-tech.com/uploadfile/file///2021082600241916.pdf In PDF document text
    • http://goldenpeak.it/userfiles/files/38310756363.pdfIn PDF document text
    • http://lebo1977.com/clients/7/7f/7f96701a3ad848a090446b6ea7dc17b1/File/57082148494.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/242fe35nm6sfvks478kqtlqp55/31953398200.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/6548581974.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/89037434396.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/zepiloviwej.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/27220952422.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/28826855348.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b1c611c2563d277ca87ca0dda6a6094b/45535757790.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/dajaxevivogugifikudex.pdfIn PDF document text
    • https://areicon.com/images/file/paxiwisifu.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/muxilutofe.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/bafofamut.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/70be25c5240d2e8b939c7cd654127cc0/pesudibejeledonorem.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac43b78437---89054860650.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/letudubamix.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/34281036198.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/tuzawave.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/75486049070.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/f9dhejmdb2gbnnobu17s60ok6b/78578451577.pdfIn PDF document text
    • http://garderoba.sk/images/_file/barawiruzezerilixiwirur.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b183e55a4819f51eb16d641d10be140e/59347219071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=peter+grill+ep+3PDF 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_off0000baf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF9 16836 bytes
SHA-256: 8a60839f5492c1091690d208f52491404e7a1a9221e5dbecea71f900c0275452
font_01_sfnt_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 10044 bytes
SHA-256: fef30a0562ebe9af32cbbffa96d705dee70cdc844dc436179d90ba3e949276b1
font_02_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1