Malicious PDF — malware analysis report

Static analysis result for SHA-256 147c1a3c907b1e5e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 01:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ff4eb37b458237ee9c883be1c0a13488 SHA-1: 1c1845c6be43a69aa408fcb018e31a7169120274 SHA-256: 147c1a3c907b1e5eb0bda2af48151fb5df77473afdeb051fa32e525c7f7b2ea1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://oniceh.ru/uplcv?utm_term=kamasutra+book+download+free+pdf+download PDF link annotation
    • http://enjoybowlramenandpoke.com/uploads/files/diwiboro.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/wubitejevomilup.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/rukorunuxuzipopas.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8eb1dd79e53340f6ae38c8108df64e0d/25383252839.pdfIn PDF document text
    • https://loyd.rs/images/file/kudenub.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/fesaxusof.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392ebf3fd11---sarulimopewofa.pdfIn PDF document text
    • https://oasis-travel.ro/files/37275214747.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/ketobelojuxufuxenemexe.pdfIn PDF document text
    • https://airxps.com/userfiles/files/jikamawan.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/48882da8c8e503cc49eac255fe223964/5861000976.pdfIn PDF document text
    • https://seikai.jp/free_images/files/26085254068.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/66671674844.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/71141638021.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/8663200154.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ffbf1e521cb5327dbc532d45dd6544b2/dadasitavi.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/lebajajitibatodawaguj.pdfIn PDF document text
    • http://novafish.it/userfiles/files/goxerogonefiladovun.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/junozuju.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/zufiwap.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/potojuvepa.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/lupujowibil.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/pelidegojejilofe.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/patewoxedijuli.pdfIn PDF document text
    • https://zzwgjx.com/d/files/21890188019.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f63ca57c1---62025562390.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/jivowawibup.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC564 10976 bytes
SHA-256: e052e7961bd5e28c20b244112180988a92425739f2b3ad63d33dc2b850493ee2
font_01_sfnt_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 20060 bytes
SHA-256: 905b161c47a1d23f6ec0d89cf0ba262f2ada414a5a44f599324d7ecaa0757f6c
font_02_sfnt_off000113f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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