Malicious PDF — malware analysis report

Static analysis result for SHA-256 87aea60d12b65d4f…

MALICIOUS

PDF

91.6 KB Created: 2021-08-03 01:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29b1e5f99cd4e5db2d19b7875a13bb5e SHA-1: 5498e7db252660a0351521f08d7f269e0129f0be SHA-256: 87aea60d12b65d4f38270fdfaad973038f151a7d35deac7945e0b792eca2bc39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=google+play+store+app+not+working+on+chromebook
    • http://gesundimjob.at/images/content/files/botubivum.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6ee26e31d4f467e2a43552e9209cf56f/98034392581.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606edbe7e4728---15376925240.pdf
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/8198449305.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd52bb9fc---nolarumukise.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9a6b92bd4229b92666057f50bf821c23/15940818660.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/q0fcunjq7k01tuomg8ujm7heco/39101979999.pdf
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/49861763417.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/d028b509076c69f51ede8ce0583a4271/58864305350.pdf
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/
    • http://tentauto23.ru/ckfinder/userfiles/files/tuperogemesisolusadi.pdf
    • https://maxflowfans.com/userfiles/file/23864877000.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021062803075480554.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b255d473c40---devimozijefigip.pdf
    • http://patriabrno.cz/userfiles/files/mebonifon.pdf
    • http://ags-sib.ru/ckfinder/userfiles/files/23116854443.pdf
    • https://abofahed.com/userfiles/file/ravegujixipenoworawedane.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ftaso3rimtuh78a004je15ghe5/bodiwidorelo.pdf
    • https://cgeminfos.ma/upload/file/69581032378.pdf
    • http://www.chatanakonci.cz/userfiles/file/97709234913.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/hhge5oos9a5s6ptbq159vlunp0/ramebovan.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/80077738022.pdf
    • https://sharjahcements.com/images/bulk_images/files/7775533587.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/32268391704.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/33857078594968792c48ab7159a2b217/guziburexinevamuni.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fedd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 16792 bytes
font_01_sfnt_off000116f4.bin
0e968041287071912f0ae32b580e83cf717a005d8cdc0c875b2fabbd7e403bee
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 11292 bytes
font_02_sfnt_off0001313d.bin
5b0f5b66eea0998cd867622f87cab3e616c0152b535a8a3dae88d073d45279ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1313D 17056 bytes