Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb89348f8e92812…

MALICIOUS

PDF

75.2 KB Created: 2021-08-31 14:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d493e74fe12b83f5f9a54c5f90d1cc2 SHA-1: 99037b47df1799ccd27c87a5c3770f6713831135 SHA-256: 8cb89348f8e9281233332b20d5b64652d6399ecacd34d58eb9f095a043fe6598
96 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://queure.ru/uplcv?utm_term=biochemistry+and+clinical+pathology+mcq PDF link annotation
    • http://tai-yang.tw/taiyang/upload/file/28146638441.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/96136874127.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94239344d8---torezabupinub.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ec961baa5b87b0203e95a3b41a6db75f/6422643043.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092500f9cc03---74365526187.pdfIn PDF document text
    • http://balone.net/_upload/file///tupetupulididumow.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/57204622457.pdfIn PDF document text
    • http://argumentua.com/i/file/14286276920.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/tiwopatuluk.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/pinapidaruxubikopa.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/gosularupirewudedu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/10e29481046972dd166a3245043fdb1b/61870069651.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0c03bbe1---23533429348.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c62709c729f852a970152fecf131db81/1247041376.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/kivupo.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/vawurefajuki.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/12011081337.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/wisaxobajobinotipexarup.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/laguwojubawopodizisamowa.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d139b39752---begufefogut.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/rulurugiwovatiwipoxawar.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3925b7c33e---45451722914.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/vetewewifurojurafewuwedo.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/55029432607.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/tegaroxegived.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3c30cea1---wabut.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/40133773202.pdfIn PDF document text
    • 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_off0000c292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 11276 bytes
SHA-256: b79662b33d02f554dc8eea28693cba97c1772d10fef28b8fb1254e96146037e5
font_02_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 16192 bytes
SHA-256: 06381a94a5a10be980f130706e83d40dae44a203268e4c15f23e68b0a9a85868

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