Malicious PDF — malware analysis report

Static analysis result for SHA-256 4667b1badf627771…

MALICIOUS

PDF

86.6 KB Created: 2021-06-27 13:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d983b6cfb070d8fb93f3c70df610965 SHA-1: 2686f4fb17b362a5192771e8df9f51987c85bbbb SHA-256: 4667b1badf6277713f59fd53f89f3b634468e9bb19e1596340bfaca840eb6721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the links and the detection results indicate a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://bafiti.com/sklep/userfiles/file/4855157734.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/pufanabetipanubumomobu.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/s73isqd4r3lvefdf2t586v96pt/kurizapevorofedofomufosav.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b3a744df2ffd0ac9f5699f87d2a221b8/gedesaxazitidogatixi.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/si1p4oi15l5hlb2ijlifdsg0er/gozuvutiwizusuvukafaz.pdf
    • http://daisytalavera.com/userfiles/files/forafodemujizedazi.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/6386891740.pdf
    • http://casaalu.com/luutru/files/gatuwunufaniw.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa31ae3f2---somokuzuwejoxivofujesoj.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/s9okacf8ud92m6dgslgl59l8qo/83134450547.pdf
    • http://spc1991.com/ckfinder/userfiles/files/ketemifanewogifofunot.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c7101faef8e---701610183.pdf
    • https://girilawfirm.com/content_files/files/73506558728.pdf
    • http://originalcheck.it/public/img_admin/file///borivexesafo.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/bae605724226ea20fcbeb81898b4d337/61806830607.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f5338b5f3b1daee110cbf0559daabedd/45132782867.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/juforuruzazigizovapezugi.pdf
    • http://xaydungphongphu.com/uploads/files/josawaja.pdf
    • http://brmhn.com/userfiles/file/20210621122412_lbaksi.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1be74dea848da4a877b1f862ec0f5ec1/2679161240.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/960f074fba2cce9800b2c2d3a6195f73/rebebixufolutis.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=apa+7th+edition+in+text+citation+3+authors
    • 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_off0000ec31.bin
9e510d85a1d7f18b04d7fc8550c41310db900e30b305fa8f1894b618781768e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 17448 bytes
font_01_sfnt_off000119cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 16792 bytes
font_02_sfnt_off000131e2.bin
5be3db48eafb7818149f7da29778fb9447b49c87dd55998938498445b87e10c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x131E2 10968 bytes