Malicious PDF — malware analysis report

Static analysis result for SHA-256 50377d65fc9698da…

MALICIOUS

PDF

88.1 KB Created: 2021-08-16 19:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3c84dd3f719391edfa2b7605a1bb0972 SHA-1: 1ec4c72d9554239be9896003f949af6f7f62be7c SHA-256: 50377d65fc9698da07a7541a7a432c46dea7c73e2f97c9ac1de944e356acadcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pratiklinik.com/img/userfiles/files/5221980136.pdf In PDF document text
    • https://turasmobilya.com/img/editor/image/file/54438451779.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/99879261003.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a1f3f13b6b36bd9f0c3b52c770d27ccb/47513854260.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210513/file/16208599684049.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/judep.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/c6kfjessoahs8lkrbuc3kdeg4n/putupit.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/39144302676.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160727cdd155ba---batafamekatavapejejemonol.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/47194001865.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/61518589491.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/96022025081.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/58256407646.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b799e076---69280439366.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5abcd130b2410a21cd08956a5023327a/bamewikezerawexetenimaxok.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/2cf74c802aa73b20c428bcc836331360/boguzewaronejimemaga.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/rbj41rpj1ahdh431k3a8cq5h11/jegerewedefuwugeromo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c7933a56c---33584026148.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/nifosesixu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/viliforisazuzowatesifajo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f34b0f88dcc---22980176056.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9d5c1a7dceb01665be993149c37b301a/fiwubewemet.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/bigane.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ec370735---92223923911.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb987054b7---xonezukidadubujixofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=printable+monthly+calendar+2021+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_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 17540 bytes
SHA-256: 8ad1705689ac910ac4df591eec2d49b8a9e98bd4802392dd55c0aa010c2ee3d4
font_01_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 11268 bytes
SHA-256: a141040b0fc87ad90cb31a4b477dc9820ebec2b2d41dc0bdfc2f2699cc08b40e
font_02_sfnt_off00013a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1