Malicious PDF — malware analysis report

Static analysis result for SHA-256 c965bbaee586a803…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 04:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae0fe8bd1e7d55d6cc6ca35e5d2b9180 SHA-1: 54ca0411240c1afaca7a009745317d4a0a683a3c SHA-256: c965bbaee586a803bdb977d1763dbf5288bda3c266628f47f836520c41d379b2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure itself does not contain readable content, but the presence of these links strongly implies a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://queure.ru/uplcv?utm_term=hd+movie+max PDF link annotation
    • http://piemonteforyou.it/userfiles/file/punotozuxosusexazukut.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341a086471f---lutidanazugitebulufe.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/fefawagetewapila.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/66122097955.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/93841099352.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/81099662215.pdfIn PDF document text
    • https://veneziashowroom.ro/app/webroot/files/userfiles/files/mifelivazatux.pdfIn PDF document text
    • http://jawarakreasi.com/file/75186773251.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/1117838334.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/xureb.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/06q0vnrtnmrhcfebn1p7i1s7k4/95238011604.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021923_14430_478.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/20760606163.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613827c0c51a7---6520153145.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/wetiparuku.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/63616464262.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/14229966484.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/gorarunavesimuruxata.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3f3ac8d28af54ee993a990852ed8da5b/nozopidarumesimepoduwu.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/97427176747.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/26845164005.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/tasetujo.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/miteroxovazejadofi.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1630654236.pdfIn PDF document text
    • https://mihalex.by/files/files/solikos.pdfIn PDF document text
    • https://insp.biz/img/file/60371175210.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/78693520460.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_off0000b54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 14768 bytes
SHA-256: 5f438f186fe774953dfad87ecebc8cc87e951766d102d24616e4d16875f0af2c
font_02_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 10052 bytes
SHA-256: 1a2286fdf94f6843a979fe8040c717c7d1d99e527b7d43710f19cb5867f055fb