Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da8061e65c4b696…

MALICIOUS

PDF

78.3 KB Created: 2021-09-09 05:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: bd7a78bc89da32a0dca2fed13f55d57b SHA-1: c703ce83d79c9c8d732fbca97dc9a855c72eb2d3 SHA-256: 5da8061e65c4b696df5d47b0f2c816fc5664e4c740fd1e3e869aafec770890a3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by an ML classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_ENABLE_LURE' heuristic indicates the document likely instructs the user to enable content, a common tactic for malware droppers. Several URLs were extracted, including one pointing to a compromised WordPress upload directory, suggesting a potential distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://didacostruzioni.it/userfiles/file/76964442082.pdf In PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/robamepobudepupazuwiw.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/93694630096.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/51131051712.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/7c1f6605ee914ec0c322ea1d8e296ddc/xogivisonexasaripevorez.pdfIn PDF document text
    • https://bloomeng.com/uploads/vorawurudixalafulixurin.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130437b46f80---pobesigirewetagexamajifi.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce9d9c2bf---71489952777.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/90695667590.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/xitikikuduxusirer.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/bikiluk.pdfIn PDF document text
    • https://atlantidegattico.it/file/fudugazawug.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/6116289835.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/5782938228.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/45629708637.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324d15cbb50---xiriwoxobiruged.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/18121043201.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/81924716657.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/fuxitonofazoteluruxutalen.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/mafakajipulidobak.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bitotefufubazojulo.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e3416ngjglmu604160pek330d7/70348178714.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/88260375282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=crear+una+cuenta+google+para+androidPDF 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_off0000cd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD28 10652 bytes
SHA-256: e0a037279885955915372f1c52694aed1a94efe06817491363a9b4aace0d5850
font_01_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 18048 bytes
SHA-256: d5776a76bb1f3412e94a758baa5c98fb11b00eb9aac08825ff985d7694ead696