Malicious PDF — malware analysis report

Static analysis result for SHA-256 457caaf1ac7909f5…

MALICIOUS

PDF

97.7 KB Created: 2021-09-16 12:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad776b0b26b10dc8bda51df9bf590cb5 SHA-1: 5f7264d2d21f7697a9152d51a25edbd60b3b3413 SHA-256: 457caaf1ac7909f5c58753ada26797c0fd5ac4afa935cc717e7d1e25f5291a20
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to trick users into revealing sensitive recovery information. The presence of numerous links to potentially compromised or disposable hosting sites, as identified by 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', further supports a phishing or credential harvesting attack pattern. Although no scripts were explicitly extracted, the PDF format itself can embed malicious JavaScript, hence T1059.007 is included as a potential vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://dudikom.pl/userfiles/file/parafaw.pdf In PDF document text
    • https://silky.ae/images/bulk_images/files/8657257724.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/99273446481.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/61517250327.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/10200181106.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161359ad78bfcd---1998917414.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/2629267694.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/44150684641.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/bumiwepusabobeluk.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/82300458207.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/90457113440.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/43450163342.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/40897438262.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/66bddef33bf4740c8a4ebf0f14a29d6a/wijozutobut.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/goguzi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139cc8c7efe1---55365609822.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/sipuwip.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/66217621057.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/50563492853.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/36998225880.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/fajiludower.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/65140594618.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/64521366236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+receiving+duplicate+text+messagesPDF 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_off000116ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AC 18272 bytes
SHA-256: e7244d6eb44d08119788a4f4c22b3313eff7eb35440b83ea83a2db065d645407
font_01_sfnt_off000146e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EFA 11108 bytes
SHA-256: e37b8ba0b7b16031d2bcb502524fdd8ae9c290938a21dede236421dde5765705

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