Malicious PDF — malware analysis report

Static analysis result for SHA-256 7262f6aa30b384d2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 11:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c91b3a36cbad29801fd1a849706e15f0 SHA-1: 7410e9821510973b5b1095034eb0bfa7c4affea2 SHA-256: 7262f6aa30b384d2c0620911dce57cc41537cacdceff13d4ddce820fa63076af
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing websites. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the presence of numerous external URIs and the heuristic firings point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=recetas+de+cocina+vegetariana+facil+pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f909cec1a6c3f50cf3bb63a065e3944f/43534199626.pdf
    • https://media-get.com/userfiles/files/13581668265.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/0ou5jb3cdvp9dd2rqghr3tr1u6/reninoxudexusoteridakij.pdf
    • http://sage-chem.com/image/files/20210826_130641.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f4e173089b247c0663c088e0c44e1ac0/31237131917.pdf
    • http://fundacjahfg.pl/upload/file/rixojuwabegakov.pdf
    • http://chi-kara.net/userfiles/file/kobonebitaf.pdf
    • http://mannaz.pl/userfiles1/file/vepilofosif.pdf
    • https://juvelyrikoscentras.lt/Files/file/48043662780.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610acccb1ab54---99137293919.pdf
    • http://interiorconsignments.com/media/file/tagode.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/feb20c6096bfd5d9c9a6cef207a10d03/501411226.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/21380832457889cdd0f669f76467d649/jalopubigovaxoludapab.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f15edaa39d2---nojolufutolokan.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58cf9e194---witebinupezanoverixas.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/lvk7rfmu8ojmtvgcegf6qm1pc7/lujekitowovajawaka.pdf
    • http://renovfab-menuiserie.com/userfiles/file/pivejasebofizaraposulol.pdf
    • https://vyrukrc.lt/userfiles/file/27368700529.pdf
    • https://funbugs.ie/files/file/60765363353.pdf
    • http://brandiassociati.it/userfiles/file/turopetefon.pdf
    • http://lalinpress.es/ckfinder/userfiles/files/zavexuni.pdf
    • https://299-45.com/CKEdit/upload/files/lolologilibusizimurunile.pdf
    • https://mumegram.com/userfiles/file/refafanoxudegigapusax.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/efi1spfq71rq40jp006ilob6ka/wunajegawededijeganakat.pdf
    • http://universalestetic.com/userfiles/file/40738020392.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_off0000d893.bin
50ad5534d0478f3bcb10e3c183d46569586e341768fbbd467ffe51163da9fbd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 10908 bytes
font_01_sfnt_off0000f1be.bin
7a032248406502204303471cd723f93c15f2e62719f60fccd7670ad1c53e6fb7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 19284 bytes
font_02_sfnt_off000122da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122DA 16792 bytes