Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81cb4d471bbb52b…

MALICIOUS

PDF

105.4 KB Created: 2021-06-24 19:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: de12a993eec11f011c60210ed9c8c80a SHA-1: d4bbb90eb26b737423daa933ebec7ff8b804d77b SHA-256: c81cb4d471bbb52b211b058cf8ea4b21a31aa2c3f79cef99e3e8de5070d49066
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crysiq.ru/uplcv?utm_term=jigarthanda+1080p+tamilrockers PDF link annotation
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d32ed726998b0309a6b654b6c25ce6c3/wefosuvojefixowadaraxi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6be97b050---25154716520.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/13820221495.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b56679d7da---28859831576.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/16138853600.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a583a38bde234c34b574afdb0643055f/90708429216.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/vefobosunafi.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/45251491786.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/94bdb9f9476f5af4b3904c286ab45d66/bugudumunonatiz.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/300a9cd90c850b6bbdd432773d67f70f/15929291098.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/fetizok.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/6959643893.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/94765718603.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b514b9e20a2---57523457908.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/cd65a84c568ac80873f2da4787cf40f3/38731503322.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f89a73b4128395f01347fdb19d7fa3e8/91542910606.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a0c136d6d---seref.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0001472b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472B 5928 bytes
SHA-256: 5d06e9c61fb0b86309acc15eaf5df7117dea2daea600ace289b6e0f2de9037d5
font_01_sfnt_off00015b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B2F 11464 bytes
SHA-256: 96114db9c16fc4542dbf46ef69332cc8ce7fbc53249f1ffb138cd616a98aa012
font_02_sfnt_off000182a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182A1 16164 bytes
SHA-256: 4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349