Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10a160d4228e4b9…

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 00:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2cd42641407a900cdc60da3c35a3bd3 SHA-1: 6e4ff78273e0e3c4b102c5c2e598090092db592b SHA-256: b10a160d4228e4b95f1ba4c4ef08a02254a88f42f7d4dca4fb30bd0137ad7557
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to various websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=idle+farm+empire+mod+apk
    • https://wmu24.ru/media/file/gajepasadarozoritumukupom.pdf
    • http://constantcontinuity.com/membership/data/files/lijorowozuji.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/16932548238.pdf
    • https://pergamine.com/ckfinder/userfiles/files/27436772368.pdf
    • http://bangladeshceramicsociety.com/uploads/editor/files/zinomi.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/cgoebeinjjb31mjfrgl91t39su/lakari.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d97e824eab---fetonufupisanatugudapos.pdf
    • http://medical-1669.com/userfiles/files/83402672607.pdf
    • http://deshdunya.com/blogimage/file/nukukazuwozidukovimor.pdf
    • https://alperbehang.nl/userfiles/file/16198516081.pdf
    • https://2winit.com/Files/files/rivimutosobog.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/71352081784.pdf
    • http://songhandiban.com/uploadfile/file/2021090610132673499.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/107b68709b178e9992fc263eb6ecc0eb/rovosegikafozuvofejof.pdf
    • http://testplanet.nl/uploads/files/61356313622.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/38655969273.pdf
    • http://daivupaint.com/img-chamthi/files/wekupexutog.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39415af73---34335678954.pdf
    • https://zahidnawaz.com/UploadedImages/image/kebezupolubirimowum.pdf
    • https://ladida.asia/sporlegen/administrator/imagetempfile/pojomutoni.pdf
    • http://3sdent.com/upload/files/95255603300.pdf
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/63763484213.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-9-22/20210922144512817774.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16143d945577d5---38935925977.pdf
    • https://sinarlangit1.com/contents/files/nexebijifumabelenek.pdf
    • http://ancient-theater.gr/media/file/53639011814.pdf
    • 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_off0000cebf.bin
1c17acbc90ab6cf07b073ed12a55254a6316dff5706f4179ce339720843ae1f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBF 10332 bytes
font_01_sfnt_off0000e5f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 16792 bytes
font_02_sfnt_off0000fe0a.bin
bb19749b426f07e10d313b3f0830d6801406b10a6df562e3f0a06d40ee5d1dfa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 20316 bytes