Malicious PDF — malware analysis report

Static analysis result for SHA-256 881bcd732f1279c5…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 19:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 832380c8cc16c5077544c69f1ebe2fb3 SHA-1: 7c9024a88f4aba61c8df1e1336b3e6b682d3ff82 SHA-256: 881bcd732f1279c55c4dd27e619ec50dbd43e0b0a452e4ee22a88e576e858fb1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eaas-journal.org/survey/userfiles/files/60921158312.pdf In PDF document text
    • http://longtra.vn/userfiles/file/betatametuzarotazu.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/33991793845.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/65457872945.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/safesimaxadag.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/seripalulotivezuzevotobin.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/83581882068.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/vomal.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rk5fa1le6ghpj3ioeshjn01msu/lutizoxiro.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/63791372339.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/45057577211.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1da4bcae665644285ff97404baece19f/82661727177.pdfIn PDF document text
    • https://actorconseil.com/files/file/kaporujetigulaluduwexida.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/zawamov.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/57238381109.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/75786959766.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/filiwexivopegojoni.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/69237246545.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/63bb42e257b93077c2700c3f6a60c685/95275649007.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/gexeguwupu.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/wubelukirufisatez.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/lusaze.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/finusiwatikevadamenojavik.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/lanofixadagik.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614165cbaa493---xezunozovejorijumute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=every+rare+fortnite+skinPDF link annotation
    • 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_off0000b45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45C 10416 bytes
SHA-256: 926ca3f8b2be660b04ace380455f5b886de9a5a5305235ca18e89952a1f39451
font_01_sfnt_off0000cc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC21 15888 bytes
SHA-256: 10e6be6bb33880bcaab3828225f7daf50ad032f20bde7b7ccf6cdf0ab79a5596
font_02_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1