Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83ae06ed17991c1…

MALICIOUS

PDF

96.3 KB Created: 2021-09-03 15:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3719da2e3bcfc3590a3a3bd616882441 SHA-1: 88f1f445a4c40b6061b0ce27b6426db32b60edf9 SHA-256: f83ae06ed17991c10b12315ccabc83f992c8f3fc5262a8db47f5705b30ebe7c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to obscure the final destination. While no scripts were explicitly extracted, the presence of external URIs and the link farm structure strongly suggest the PDF is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/wabafofemezefufot.pdf In PDF document text
    • http://alliance-ic.ru/uploads/file/49921705629.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/gulixemegesaperuweduzo.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/sowig.pdfIn PDF document text
    • https://meccanicagambirasio.it/file/92895349965.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1610b264430735---53518647286.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/cc94ac6f7f2c292c2a8e2c562ac93121/xoduxenegupadifibopiw.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/15868350625.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be34d3f326c---xenul.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2c61b7d3c23eb671ffd2c65b00beaba3/81117333561.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6f4dab345---xalumuwepoliwesunezaf.pdfIn PDF document text
    • https://seerupit.dk/assens/file/vudaduginobibiwupitokaxos.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/lopil.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/91268701685.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/dh82v3mopondoc24jl0jks77oq/zasigobirakenulepodedik.pdfIn PDF document text
    • https://computerzone.pk/file/dewixepewe.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/59617838992.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/tugejizaxu.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/31585248998.pdfIn PDF document text
    • http://www.buildonhope.org/file/nerixemoporiwibije.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/kuvefadunemizajigu.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuwojexupozerimeranexo.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/13632682211.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/41866452611.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/67800809186.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/xawomen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cissp+question+bank+2019+pdfPDF 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_off0001146c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146C 16872 bytes
SHA-256: af3da0b965ec51f83f300302e519305a165439aad9baa530a6cc06c4d1099e10
font_01_sfnt_off00014075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001588c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588C 11316 bytes
SHA-256: 3bd98912c1c0b4560c2df5cdaf37ce1c3ca2a4466485eae039002a44bfea5f32

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