Malicious PDF — malware analysis report

Static analysis result for SHA-256 e555b80cb373bd3f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 13:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7e8561f3edba3227776f4aa55c08d95 SHA-1: bde1cb8432aa3bb44970896c2d04e1439c1d34e8 SHA-256: e555b80cb373bd3f40990e63f3a2ad0fb24aedf26e3fbd33ce5d16623009e364
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document's structure and URL patterns align with common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=wordly+wise+book+9+lesson+6+answer+key PDF link annotation
    • http://sakuragiramenandsushi.com/uploads/files/zafuwepedipaku.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161330550c7012---11070132559.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/64355621811.pdfIn PDF document text
    • http://rrarental.org/upload/file/83681537037.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b9918e0b---gavewatekut.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/tasutu.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/93433927047.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/votugedikodokot.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/41773722341.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/64123589182.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/76589793798.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/fobixopumipubipaperex.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/eb748d2cffb3189b135a27fbf3940dae/nozubapori.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/mixazemomexakejav.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b959bbb170cc2bf1806fa634d57184d6/57543738522.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/kusafirit.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/torola.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109112214269134.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/tuposonazegamatu.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161443ab9d2d76---55290402471.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/xotaluvajaxeladunurepifej.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/15170829620.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/14250488472.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109200622034546.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_off0000c42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42B 15768 bytes
SHA-256: 253df0564b00af84765b366d93df7095fb14d76017e03032163d521373c65104
font_01_sfnt_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D3 10904 bytes
SHA-256: 8c0df103b54c0089f7a9c3dd56caa1825fe09284b2dc76e73b89d723e0254a42