Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfd98b4370ee2d8…

MALICIOUS

PDF

82.2 KB Created: 2021-08-31 20:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: afee4a86d53c476c5405a8a2f751936c SHA-1: 1b5960d753971e3b47c3a06a736e7e9b8eaa45c0 SHA-256: 2bfd98b4370ee2d80f0c59a0ba02be83aad31bb11dd2aa1bfd4ec3138a6a7692
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on compromised or disposable domains. The primary attack pattern appears to be directing users to these malicious sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=ada+county+idaho+assessor+property+search PDF link annotation
    • http://myshopekerala.com/userfiles/file/zawazajawux.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/65389663388.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/86908369702.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/gl6un97ag9bmssm27tlo3p5cos/23491097536.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75753d06ca---mofatifuxoluxibubamododi.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/somiva.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/36033429825.pdfIn PDF document text
    • http://maksimetall.ru/files/ditaxele.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/97176683702.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/bozepu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f26fea96e9f---jebafekaworobu.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/99898336366.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/ritukerurejiletebovolez.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f991e83f4f27a0516f08081482e21016/98876518926.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beafcb12f29---92379402937.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/26606441255.pdfIn PDF document text
    • http://axwelindia.com/uploads/fenefubujenixu.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/xajonusemepuxakubiwizan.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/bijesufokirikomov.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/34257067796.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33cb1cd32c---suronemazoji.pdfIn PDF document text
    • https://badrivishal.com/media/pepitesubuxofanis.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/4a814632c0b1ad48be2c13e3de69e5f1/79225617645.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9c6d004f---bivasazijugefaj.pdfIn PDF document text
    • http://vanhacollection.com/images/files/14939107181.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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 17836 bytes
SHA-256: dd1c3983534b59ab315adbaeba819f1a0a6cf7959443192317ad231addbe12f3
font_01_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 10760 bytes
SHA-256: af9b031220098087bdf7d90b543f729d4075af83d6532c1ce1d618ae4e3908b7
font_02_sfnt_off000122bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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