Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9a40aac3f7e543…

MALICIOUS

PDF

92.1 KB Created: 2021-09-09 05:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63cc742ada35f8c884dec6ff2831a797 SHA-1: d5755cb41a191bfeb394876fb85045f3ba2a5dfa SHA-256: ee9a40aac3f7e543f8352f35711dfb8a098a79e4aa2770abaa55c5a9728fe763
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to numerous unknown domains, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the heuristic firings strongly suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://epwuae.com/userfiles/file/bojepipisivezujuxubil.pdf In PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630708675/files/vowimevevoburidif.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/44852094249.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-6/20210906080527648153.pdfIn PDF document text
    • http://domuran.pl/files/file/fikaza.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395dc600877---16268056231.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f440dc602b---9275326092.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/kabis.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613236cb4349e---zuvuzurasepoviketu.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/14435152303.pdfIn PDF document text
    • https://carlojans.com/cms/file/8579286452.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/towunafewosonukeweluwab.pdfIn PDF document text
    • http://hidramaco.com/files/files/68386132437.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e2f3cedee---54546524209.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/debuvo.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/vixedezuxiditemenukapevif.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/44605919012.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/87259796135.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134452384f29---27889076815.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/nigufufeg.pdfIn PDF document text
    • https://cityface.cz/res/file/4146600406.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/salisogaredevejisosalede.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kolasesoviwinosixegu.pdfIn PDF document text
    • https://solturism.ro/images/file/deledimowewod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=listen+to+your+heart+listen+to+the+rainPDF 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_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 19964 bytes
SHA-256: 2f9b70baad0228381f616f25163afd6827de077e0ebafd05454fec86df3bc403
font_01_sfnt_off00013362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B79 10376 bytes
SHA-256: 02a6e93089519d2bcb4b4b43bf99cdf068f9262389a86556bab7f0704deec8fd