Malicious PDF — malware analysis report

Static analysis result for SHA-256 e916e3795b87220c…

MALICIOUS

PDF

75.0 KB Created: 2021-09-23 00:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: acf4f849b7a5149c9fd41d59636e0cad SHA-1: abb270d6bd296a99ebe200083b2692ba470b0e86 SHA-256: e916e3795b87220ce7610798c889a06cd3ae041586634097a4c390a5ea464fa5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious actions within PDFs. The presence of multiple link farm heuristics and numerous extracted URLs, many pointing to compromised CMS uploads, suggests a phishing or malware distribution campaign. The primary attack vector is likely spearphishing attachment, with the embedded JavaScript serving as the execution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda84c7304---42946495971.pdf In PDF document text
    • http://www.reeder.ee/files/filemanager/tokokowasubajimufom.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/45a1cbbad030852d5d5192cfcd1338af/lapanedu.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/40351394454.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/xijefuzudevoku.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/gunofivuxemoma.pdfIn PDF document text
    • https://pspgenuine.com/ci/userfiles/files/seregaboramadi.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/xirupupuzifaditow.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/dulibikite.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/mokixotelejik.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614907d3066bf---tarijuruzeluwibaluko.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16143c3df9e176---sumililinabufu.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/xokesazadokatazukopumular.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/morasexufutodilodogas.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a9744bca96b03f79cc9e811a96a51cfc/zujemunot.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132434e56e5c---ziwiguramezuxinijik.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/48364906163.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/lorigujajitonutumuropusod.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/lemepawokaj.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/jemeluma.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/toxaxijopaji.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/6004396451.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/68631285291.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/jisupuwudivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=light+gun+games+wiiPDF 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_off0000c41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41E 16724 bytes
SHA-256: 284a80550e0843b3de0d668891e3815f817367136dd2ccd97addaa8189b924f1
font_01_sfnt_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 10432 bytes
SHA-256: 70d8b9304b5682ab452e19b5c94160ddb2c660d99820cb8a502b4a7815228e84
font_02_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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