Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56c4d506f3dec29…

MALICIOUS

PDF

86.1 KB Created: 2021-07-06 01:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fbaed129c457f2e36f303f5ceb0187f4 SHA-1: b86190e6f35538eb02f15a4f2d68f203b50a7255 SHA-256: b56c4d506f3dec2956fdb2ed321d35b950014a68e6af42770451134c0c2abc34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. While no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc31ae94c1---pezafovazif.pdf In PDF document text
    • http://sacoorhealth.pt/site/upload/file/ronetegidutovapugovolowe.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/99fb459096afd075e274a4a31be4baee/vofel.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab7ff1096c---davoroso.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160700dac10817---2800765748.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7fc600c18e1cbbce0b43c71b90d4529c/70439242918.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/49089500850.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/93806511400.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f1f4629e---puzulezijanes.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/5106aec0289befa667de4da8a605d37c/4317828322.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9b65e632c---towezokenepotilo.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/xajubi.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ceecc2e9e---31474291369.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/5188651293.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/bibolivedosimomezanide.pdfIn PDF document text
    • http://bronia.org/userfiles/file/56915506989.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/63332574288.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/tolexijozusowupugejevuj.pdfIn PDF document text
    • https://topupdana.com/contents//files/ramitisokadexekipi.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/27425641092.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/25951821730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=i+love+u+mummy+song+mp3+downloadPDF 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_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 10936 bytes
SHA-256: 57dd19b4bd480c5377815a23999fe43fe9037ac80d69074942d0f7828c785f5f
font_01_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 17408 bytes
SHA-256: 0cf76b5044b6f693382fcd5dd3a1c4bb5c0ffbdbb7ea01f477aef19ac3c68d46