Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5750c1a5b4917e…

MALICIOUS

PDF

97.4 KB Created: 2021-08-26 00:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa152014d3e0a8b7e02485580a0d1067 SHA-1: a99f4d4f1bf302d19a272693e1d567b09535da84 SHA-256: bd5750c1a5b4917e6202e12d1a3d7b24daa5700ac02bf6bb406d7d1a75995e46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://hainutedecopii.eu/ckfinder/userfiles/files/31101871346.pdf In PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/keguwitajejipixajet.pdfIn PDF document text
    • http://rumputhijau.com/contents//files/wegeviruno.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/tisevodoxudosojilarire.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607233a6df5eb---8147862411.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093dc705581b---87401128451.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/48208310243.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/0525961a47219e979f2d50dbd0886cb6/nefiko.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/19504562487.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/78396557290.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e49fb3a298ab5bc33d1278fbe2472b37/rasojugi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e8e6ff6f48b8f5f1dc808a6c8cfa4ab4/41857777747.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/b790720b8630c5d0aad9e47f73264f5f/kuzuvimikokolojiz.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160887a77ed1e4---7759000977.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5f8c9bd804e309e2fcc042ac89dbd1cb/tuxederibudenogubunuk.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714412e2c1b---57345149815.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/38937103820.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a12247a9ad6---zunufebewi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608496b6c1b4f---55993457003.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/jiguxoge.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/puxirifuredenal.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/32697790950.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/tomarolup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+litany+of+the+blessed+virgin+mary+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_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 11228 bytes
SHA-256: 63933b3aba58bd3be63a7fb007296f18a25eafff86f4b2198313c021286649d3
font_01_sfnt_off00012f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3C 18864 bytes
SHA-256: f4dec2466f5f7a76a382ac02a9fb208098a87ac0b486af367370371210a8b7d3
font_02_sfnt_off00015f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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