Malicious PDF — malware analysis report

Static analysis result for SHA-256 677d633b525d02ef…

MALICIOUS

PDF

82.6 KB Created: 2021-08-30 00:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e385567341cfbb772e231fe414a562e2 SHA-1: dd61b568c3d83ac913c4570f34c0900c21ac6536 SHA-256: 677d633b525d02efe26d471df674c4e9b5b1b8ec397827e852054ed766d075a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of external links and the nature of the heuristics indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://vinag7furniture.com/app/webroot/files/editor_upload/files/75468709288.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0490383f72---supakatosavedipasivopap.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/49064419691.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/fivaxolelurotefuwu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4bdb8faf6---wibikojedipanolipamojesa.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/78621702900.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/betadu.pdfIn PDF document text
    • http://agavietnam.com/img/files/59893792208.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/85424227642.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/dapifenesogunikevupepu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sorukizukaxupinirarunul.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/930d3e74291f02b8062029d32367a9f8/kuvelerefalabu.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/kegasog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f91a4222fb---82956672174.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/64820029908.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/5032720951.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/nowusuximijep.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/pareneg.pdfIn PDF document text
    • http://888chji.com/userfiles/files/sevumafiwuputixode.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/b43c16463d26659f04ab2edba9716280/kajamotalimogotugada.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/28776851983.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f787120750a---28516610488.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2173af13d---42467556688.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/xuvedebisodeb.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2cdf29bf4---nadativodumimipumijedog.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5e841f5a---mabogisorujofowefunafi.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/51384985911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+is+collective+noun+of+shipsPDF 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_off0000e09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09B 10636 bytes
SHA-256: 050c9e48a2ca2539c65ae0ba78b700f6950391a4d135b03b5b8112c6b970aa53
font_01_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 16620 bytes
SHA-256: 35a4681fde6e6a7266356fd8cf58561ca992fa02530fe7d083792bf1ef522cbc
font_02_sfnt_off00012369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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