Malicious PDF — malware analysis report

Static analysis result for SHA-256 5738584f10dd6b0b…

MALICIOUS

PDF

98.3 KB Created: 2021-06-27 16:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d6375ba0712fb45250050369d82a145 SHA-1: 86a21288274236eb750c815a30975fb4631c3c12 SHA-256: 5738584f10dd6b0b60f3aabdf5ac871366c6aacce0346c943fe63923b7d8b5c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing pages. The presence of many distinct hosts and UTM parameters suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 https://cructi.ru/uplcv?utm_term=dynasty+warriors+9+weapons
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/berorekuvamozimerola.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cee812ff9---xuduwiboruzu.pdf
    • http://atut-biuro.com/uploaded/file/jafifuda.pdf
    • https://airshow-bg.com/file/bafubizevasif.pdf
    • https://hansenlight.com/UploadFile/files/84196754599.pdf
    • http://alpha-cp.com/userfiles/file/dizureliluzejexa.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b777f424c43---riniger.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/6adee82b0271f1f1d5527f73a66af1d0/tawoxarinagu.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78787eeeb0d4e143127f8435ddd3072e/86587469476.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/25eacd908c2ea4771a469092b7f32599/vukewunejatalopu.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/edb21c7f695bbdcb427352f2d4d48a71/bosobenoxevitogaro.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/803a1cfb4040eea4b5f82f51cfc8f6cb/fabovomuf.pdf
    • http://nextgt.eu/uploads/file/19688018612.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/29586038465.pdf
    • https://rhodium.vn/uploads/news_file/39544126481.pdf
    • http://gramercygrand.ru/files/file/70002256666.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c138212022b---ladogasafeduliji.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16087574f8f44d---jarusabedewuguviza.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ac6ad2fb5---zilasatexofilonako.pdf
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/visob.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/879a526bd63d7c5c8ee0a739922fda5e/33815913458.pdf
    • https://damiel.eu/userfiles/file/zesigoga.pdf
    • https://clickkedai.com/userfiles/file/73952210894.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97b4ea613---mutojitalade.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba96c1186f---kolonoruruguduburefarele.pdf
    • https://lapdonline.org/file/36271785327.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_off00012086.bin
0901e7d09beebcb55cd5ea031d8fa4a9f6877c53b2f80190eac0ee7571307851
pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 16552 bytes
font_01_sfnt_off00014ba4.bin
217b93435d36bbc85a98dec71d9d02851c7ab04cb0db8e118f38508427b2bc98
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA4 10568 bytes
font_02_sfnt_off00016403.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16403 16792 bytes