Malicious PDF — malware analysis report

Static analysis result for SHA-256 7433411026045aca…

MALICIOUS

PDF

71.1 KB Created: 2021-09-13 01:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d20cb18fe1709baa1d299e05ccf7936b SHA-1: ab39b5c1db56b11b6d8ad9540c6f15f9a39f6ae3 SHA-256: 7433411026045acaaaf415a88a9d18dd231bdffd358e3b31563fa37f2ba0dba3
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm characteristics suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://fullx.net/files/miwunilezamivewebirizuvi.pdf In PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210913052104.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/nugalasixa.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/75302615974.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/70802518454.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/venupas.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/nafigopupinasujurome.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/15141676227.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/terabanogirefokeli.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ch3b6i17m0b0iqc2lqrm5d50ni/niwusoniwelul.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109041346596091.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/84266961793.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/75135280212.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f273e48e06---48706396257.pdfIn PDF document text
    • http://htygroup.com/upload/files/miluropaxilalo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ff6b99cfebb0b001a9540ff8cc3dda0b/31159444042.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/26007957001.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/55671074619.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210908072830_8lmon3.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/vewevamajubuwedusoduw.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/rupifumimemuxakomaxumen.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/26066121271.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210902_D772DA8555C85709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=old+version+vidmate+app+free+downloadPDF 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_off0000b5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B6 10836 bytes
SHA-256: 081652077f0046dfbd700a7bc7c0332bc11539c6b4248524b41966867b4639ea
font_01_sfnt_off0000cebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBB 15868 bytes
SHA-256: 56068f0194c5631a6e1cd5bf52c9b79e9d46a9c0ffa943edbb87c78cf27ab785
font_02_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1