Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc440b85a6bd9861…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 23:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ace543b2934df1baf4a5ed498f28c8ca SHA-1: 88d648e8699ed4beec8366bfece540155bf1f16c SHA-256: dc440b85a6bd98617766f1c68ece5b4a16e8afdcaed9f8956bb7600a174002ab
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL analysis strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=people+skills+pdf PDF link annotation
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/44841942323.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/vobotowotamepogisotuxivu.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210901121625761.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161365efa6e9a2---44737035098.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuvelebi.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/80434611e8551f15607c4249e2b680ee/27029564643.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/fagaf.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/36520976970.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/29671932949.pdfIn PDF document text
    • https://bursac.net/userfiles/file/sijalozebemiku.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614657594edbb---79059544079.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/53934937073.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7cee1595748fcac9979938a93b1d3d74/nujikudojakefovalenida.pdfIn PDF document text
    • http://sql110.com/pic/88001005039.pdfIn PDF document text
    • http://citra.cl/userfiles/file/buloneboko.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/62965266119.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/57017367086.pdfIn PDF document text
    • https://anup.bo/images/files/dusawurimowabefafuz.pdfIn PDF document text
    • http://grabnerestriche.at/sigam.pdfIn PDF document text
    • http://okun.su/upload/file/zimofufuwelikezoxigam.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/binavasuvazazezodawutidop.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/tawuvopobowapujuku.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/woreledafadasemi.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/zopifaxabewijuwatofenom.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_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 16756 bytes
SHA-256: e311ad23d67acbe06cf17cce06d1e5362f18bc22e3d847c8868dd43032b9335b
font_01_sfnt_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 10120 bytes
SHA-256: 7f4ad038ae5a2ef99b2d526a70830a8bf246ea68bb5f84017bc79b658178463a

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