Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a4e75f6e5071ea…

MALICIOUS

PDF

91.5 KB Created: 2021-09-11 01:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27e415d708bca25e1758753b506f4192 SHA-1: 2f61426732f9bdc92d6b8800908b202fe051644e SHA-256: a1a4e75f6e5071ea950b470ebe299cc52a4d4582f75c18229c9d360c6c5b0c6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final destination. The presence of embedded JavaScript, flagged by heuristics, suggests the document may attempt to execute malicious code or further obfuscate the redirection process. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tbff-bygg.se/img/files/4920278232.pdf In PDF document text
    • http://vivaibonomo.it/userfiles/files/90573749481.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/e0ngkmr3lgl67adtbl5re8ut02/78437116905.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/rekanesu.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/timeredoguzafabosufumumiz.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161353d6debe40---pejagubozarorubinoti.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/44519270745.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/69264589978.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/59434595384.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/wowesovomeraso.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/59360835919.pdfIn PDF document text
    • http://arsvet.ru/img/upload/18798219228.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/pisadokaliduzabejo.pdfIn PDF document text
    • https://majubesar.org/contents/files/89513255526.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/kupevutazikipepe.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/6021131753.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/bixebubalefuzajaxazesono.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/vulomudamimodipu.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://www.galiantsolutions.com/emailimages/file/88377865933.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/32605270870.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/14514881755.pdfIn PDF document text
    • http://hadt.vn/upload/files/32699358235.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/64958396533.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/996bb88304a98da0715cb7f0f1d2b10e/waxexegurivasegib.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/93002205525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+1619+project+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_off000100bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CD 18116 bytes
SHA-256: 071ca338de4033384d10044300789b04650ed9bd5bfe56dfc5ff1f5c42227218
font_02_sfnt_off00014858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14858 10628 bytes
SHA-256: 5960f59bc8805c0420aaefa30e2e0091db2faa2b8031364440a112fc3184533c

Open this report in the interactive analyzer, or submit your own file for analysis.