Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7aaacef720af04…

MALICIOUS

PDF

89.0 KB Created: 2021-09-08 06:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58bf710dfbc6ffb155b157a5c3a47e0d SHA-1: 0be65aae619bcbc96ba93a96557b764fea8d0c5f SHA-256: ce7aaacef720af04175cd0c450001a5c19caa74141fe150eea15860b44afef31
156 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The PDF structure itself does not contain readable content, but the heuristics strongly suggest a malicious intent to host or link to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tafgambiatours.com/userfiles/file/34589283967.pdf In PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12cee232fb---68221720222.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/buzawimisisase.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/41tcbdup7rnf4k6aijeki1sqdd/jekugadesix.pdfIn PDF document text
    • http://esistore.de/userfiles/file/getab.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/nosuwajezamodifubop.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609476d32170b---fidosovararaza.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0729ee819---fivupala.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/40eafb950114db0804a85c51774fbc3a/vuvotife.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f7050b665---2328065188.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f9b6a2797---56956223090.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/56ab4335c324db407b7246c799c86f56/77992157790.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a75fb532bb2---21758183369.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/pukojiwibabuvedir.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6f540bbb---69453795246.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/tipifitegutibavofuzekodex.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c54a1957a0d---xigokowakitisiwafasudose.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/tifigasugepalexijide.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/xawimibivoxawonefi.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/tubuziwifiboxonowozimu.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/miworoxa.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/suwenafaradajero.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/32407323734.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/23b3dd727fc68fb88a9b3626e9e24ef4/ramilezoximezi.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/51770951147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=statistical+image+processing+techniques+for+noisy+images+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_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 11504 bytes
SHA-256: fbb98c7245382bafbbbeeb0dd68f81bdb3c16a0885993ed274978fac333606f7
font_02_sfnt_off00012544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12544 18588 bytes
SHA-256: e84939fa8ac134be1d2a3ee986ceeb894e0cbf0dc3cb910715c3b6f3d857ff88

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