Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a701e194d574862…

MALICIOUS

PDF

95.0 KB Created: 2021-09-04 00:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a0c8857e9b74129dc4335a26278da87 SHA-1: 3d0f7921315c6782a753de2ef4bb3d0ac14efcac SHA-256: 8a701e194d574862a050a78003358ed79ec906a073abcbfe712d683bed7752b4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 https://cristalparkhotel.com.ve/ckfinder/userfiles/files/megexogokupigef.pdf
    • http://khautrangkhangviet.com/upload/img/files/genodogimesemugos.pdf
    • https://svingenieria.cl/userfiles/file/70134628169.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/97f28e289555598993db4857abf4cca4/xetetamavidejigi.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8rnb1dkab5aap4lf3cknbalopb/9611549711.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d79931257d4---6431789232.pdf
    • http://cphs1970.net/clients/877309/File/60311362649.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/77cfe7a8d990ac56dfb97ac996816a02/fanogemumene.pdf
    • http://hmondo.com/userData/board/file/45107773840.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/86532546714.pdf
    • http://win-sonic.com/ck_imgs/files/sowoziliji.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611f72c909e03---nudagevovewuvilogufof.pdf
    • https://fenicia.uy/fenicia.com.uy/uploads/files/zewota.pdf
    • http://pc75.net/upfiles/file/1627466818.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/9bb7f20759a444bac3c477969b237c61/34392180471.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/4cd140a84437adb8d75f0187872fc31f/57998404385.pdf
    • http://tauroconsulting.pl/userfiles/file/situparavu.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/91667354be94de00b91fc1aff1328a34/tebefokojuluwagu.pdf
    • http://oodow.cn/upload/file/210629035805868837f2woat2e6ssg.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/k05uejssirv098j1blej0gn1p9/55513033328.pdf
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/vakojukejebifufibasukego.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/04c91879c1f5e78430612dc860ddfb3d/niwakunamovudigurafuv.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/7770777325.pdf
    • https://dogathermalhotel.com/resimler/files/63051845950.pdf
    • http://metisentry.net/ckfinder/userfiles/files/61320101440.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/fufipuzamukufaziza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=writing+book+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f5f.bin
95e3c101532bfe99d705d389bf332fca1a6ba8ac0cfa5e79b2bb0fcbea3b3c14
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 10816 bytes
font_01_sfnt_off00012808.bin
3b0dcfcdb0438b89bc437b9791cd2797ff434f765cf77f45dd9f13c2aff45d58
pdf-font-stream PDF embedded font (sfnt) at offset 0x12808 17748 bytes
font_02_sfnt_off000155b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x155B2 16792 bytes