Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a3fb6e798abe13…

MALICIOUS

PDF

100.0 KB Created: 2021-07-08 03:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 26ab148fdc994c922d9e5b6ee5e53cd3 SHA-1: 99dc5a7a737b8218b735fbb0eaf7da2dee1bbe23 SHA-256: 27a3fb6e798abe13eff0157882dbfc4c44d7351332f07dce2cd675df53bbe670
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c7a0c4ec2---68536420126.pdf In PDF document text
    • https://shop-ecobati.com/medias/upload/files/bonudaka.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d098b9eed9---xedupivupi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700777d153d---90980842908.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/27942116706.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/82aac21a394d1246b5a4c7a50321f67d/84240587699.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/94863672926.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/likezimun.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/366a8dd5d5801ea023c124f962c0d3b4/81127235229.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/97593162935.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/72972041375.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f0f5bf0d2---80962037570.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/lntj55mvaa4lv60rm263daqhm3/69711479629.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f5735b782c3fb6e447be5852a94cdaca/fovudidumufivubodopuf.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/67470651775.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c614e5ec83---daweziwi.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/zemujuru.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/vegekemagelubiwuxosuxo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb60e77ade4---metabalekinefulix.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jizomedipesomufonikekejo.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/40955653438.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a7356e0fe63---28877273172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=milk+collection+centre+project+reportPDF 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_off00012658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6F 10252 bytes
SHA-256: fecd69667f0521af767c92110a64d2c9ab55f8818145794fc2aea03323b76cde
font_02_sfnt_off00015584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15584 17488 bytes
SHA-256: bf6f9ce8171a119f3dd37a83049df6796a9005e36a8fb1c5ad961b1f4ed24b99

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