Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9721c8b48c2bf2b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 17:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c304f324d1c17a92d8105490cb6b43b SHA-1: d5661ad1db1b68c073942c27b944139d6f381a0b SHA-256: e9721c8b48c2bf2bb6f8563bdc1945dc5f6969e7002da13080be1af5abee0b51
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised CMS upload directories and disposable hosting. The embedded URLs suggest an attempt to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://world-green-hope.com/uploads/files/14618158337.pdf In PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/nibomutaju.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/76264732836.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/peder.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/90236540750.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b0f939a9c---dajaralozimaga.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/56939751276.pdfIn PDF document text
    • http://0048.pl/48files/file/14354214117.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/puwegi.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614200df59640---54319197231.pdfIn PDF document text
    • https://palet-school.com/files/files/dopanoladut.pdfIn PDF document text
    • https://southafricapools.com/contents/files/jifidinawuwaxujukidosu.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/84498192885.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/gasasere.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/musigodexufisuxukumas.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/94996940562.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/veporanitovosonepe.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/75123869008.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/11596717245.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/mosugesarowoxeworipizoxox.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/nogewogofisi.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/85836916459.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16140becb78145---93637362820.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210906102836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=back+menu+apkPDF 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_off0000ce9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 19316 bytes
SHA-256: 62fbc7b029ebaab4012450dfc322c85f61e3b40f1a036364156070a3ca36d882
font_02_sfnt_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 10156 bytes
SHA-256: f5c6b0e6ef0881913e1fdd3c94bea825b7465d37b99db676e214e70445cec6e1