Malicious PDF — malware analysis report

Static analysis result for SHA-256 96eb6e7c154786f8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 18:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f28c1c51bb089d6167a91c6a8b15fe3 SHA-1: 911ff385c82645647855f42b2d15653dbe74778f SHA-256: 96eb6e7c154786f8a676c816dcbf33637a0bfaa433782f7a09b5f4633fad600a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. The document body is heavily obfuscated and does not provide clear instructions, but the heuristic firings and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mrpokedb.com/uploads/files/begazemutukumuzi.pdf In PDF document text
    • https://babamansurkurhuseyin.com/uni/yuklemeler/file/zivenikizofubekalirinof.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/729393628.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/35285084864.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/60936564738.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/wuwafutepitefuj.pdfIn PDF document text
    • https://777mto.info/contents/files/67162455991.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/dejoraniwijikirironud.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/vunedepumosu.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/76536953942.pdfIn PDF document text
    • http://www.520amis.com/upload/files/50284264481.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/rubeselulopipex.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/pupasibujekujapegatev.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613568e0da9ce---simililaranojolazamuzod.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6a7064d8---rewuxelokusegozifelaxit.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161342403ad136---tiwetalekoxu.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/bifazezujuribuwisefaromoj.pdfIn PDF document text
    • http://3sdent.com/upload/files/24311883021.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/49242147748.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zadebowomudu.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/zeluzeraruvofefuka.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/43689903083.pdfIn PDF document text
    • http://jinyezi.cn/upload/tevovodajipotipozijosabow.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/patojubufikugixisebuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+custom+live+wallpapers+on+iphone+6PDF 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_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 11232 bytes
SHA-256: b4af941dcc8ba6e823403767efde2f5c536c111be4c0e6e849eacd6bee987788
font_01_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 17256 bytes
SHA-256: 3e6f17445e9865f6e21d9a79377805d9f501571ba55a24de623ea165fd2589f0
font_02_sfnt_off00011e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1