Malicious PDF — malware analysis report

Static analysis result for SHA-256 a235422a917cf630…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 12:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f21d73266071408fe4d39aa62b83cd48 SHA-1: 9888dce1e3c344f3113a84a849e14b8a6d0de5ee SHA-256: a235422a917cf630096c111ad64a5d032510c39991edc5493029b6d1910fff5e
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. Numerous external URLs were found, many hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the overall pattern suggests a social engineering lure to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://synerhu.ru/uplcv?utm_term=numerical+analysis+books+free+download+pdf PDF link annotation
    • https://gulfb2b.com/userfiles/file/7852928490.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/digoluwazanodet.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482828791c---wabadujotolukilofuvitavop.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/43024626453.pdfIn PDF document text
    • http://grupophi.es/uploads/files/zawezesopafedisux.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/lmq8eb35ckqhf8rkcc53knke00/60701424604.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/laeuoogc08rvk0t7m5f0ogc647/rurejotomugopujax.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/77023406062.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/027b044932810ac2181cf98aaabf5dc3/nuguj.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/25278084200.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210728_A0543F5A3F61DC1F.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/8437248553.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/tirejewavemef.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/56660233483.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/16034645761.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/wusawisijo.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/rojefutazirokibed.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/xegatidanelidokixuferuwa.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/99665524999.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/97662946973.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/84737586159.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/vilagadozoras.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087a657efc99---mawitinezaferoxewasaxegu.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 18208 bytes
SHA-256: 15c7f6a3e6dced0c4eeaab6fb0d98c335dcb53157adf8a8d41d2f2a0a2966419
font_02_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 11192 bytes
SHA-256: 2065810f73d30b12cc7eb935a1990429cc8767ccaed0283eec719a1a9ac10adf

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