Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b847cab188e6a1…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 14:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0402e901cb755f4391ce3751142ca44d SHA-1: 77af8508e53fbe68ec17824f01ea82d2319ee2bb SHA-256: 97b847cab188e6a1bab9c62d51a35ddbad3d9697faa1cb38e008f5a195ea0cd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://open-call.fr/uploaded/files/40178018276.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b32058ec18a4a50752d57e009286f18c/terenemofasififubo.pdf
    • http://polimak.pl/userfiles/file/jeximamilezexapuruzironi.pdf
    • https://llsindia.in/FCKeditor/file/32281976293.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/pasil.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d6daf43d4bb93e3257a7e0e65512bd54/niteruvajatuworerew.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cde2cdc77a---72319956511.pdf
    • https://lwim-ouargla.dz/ar/files/puzajazido.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/teo42h2cta25lv0npf9rj141aq/83917630331.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6k5fvfqpqmmfih7u4hbgbh5v4e/jasoxul.pdf
    • http://195exim.com/datas/files/jonape.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3963e651b8c15d75d53f902a56af0315/sogilulesufaxovon.pdf
    • http://tktravel.shop/FileData/ckfinder/files/20210603_8D5D52B9F76CB3D6.pdf
    • http://prosquash.by/data/xobixomavedumisevofo.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/e9h3pj4lrsl6rd4dgk5r9605j4/49803766221.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/34832427922.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/081fae917f54e8c8274becad280830c1/vurup.pdf
    • http://tungalag.mn/userfiles/files/bomozetawurusulozug.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609172279dcd4---nitoxonemazulenej.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/he3n67etp5frl1nj7er0o5mi11/80878718580.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f58a86986---jonugaru.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c649e1157c7---18632297060.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=class+11+english+chapter+8+question+answer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f260.bin
6cb3e694d78bc0c7b0a686f08b31800c647b06ba49c9fc533a6c529ab5162f06
pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 16884 bytes
font_01_sfnt_off00011dc8.bin
4809dbf4d6a29b19a09e318b10a664b2aa3dcc2b12f2c23dceda8744cb4c3745
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 11276 bytes
font_02_sfnt_off00013809.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13809 16792 bytes