Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2100cec9418eefd…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 23:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e630b3d8bf4f171e8951dc256f557fe8 SHA-1: e3a56eb16c1b5febc39bc73cc601e98031b14223 SHA-256: e2100cec9418eefdae05e42e0ddbca5d0bbd175b7ebb12a48fa85458b69bfc80
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The embedded URLs and link farm structure suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=vr+thrills+roller+coaster+360+mod+apk PDF link annotation
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/68jp8te6klhnjlo76ll17df6uu/waxesewitukevojef.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9ae0e8cf---39554469713.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/nakomigajif.pdfIn PDF document text
    • http://tdbm.vn/upload/files/99998140536.pdfIn PDF document text
    • https://aildf.in/userfiles/file/81177703350.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/48038573562.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/10669625253.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/guvubo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614150e71615a---36780979243.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109101356163556.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/33501010208.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59699864900.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/gepasiwowugelosizeg.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/48644373136.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/93624364232.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/19541141076.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/91692516096.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/12196714144.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16138f07ddfd9d---21772194820.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/76246405895.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/rasinofekusozimaxidira.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/67897723858.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e0e822f4c6f7c2f11227e74ed47e9736/babujexufanenozoloxo.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/tuzaxiturew.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_off0000bcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 17656 bytes
SHA-256: 547345ccc3e83629e9ae028ff05dc8fe902bf899f9ee6c325ef4ea1b2ee76ed0
font_02_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 11200 bytes
SHA-256: 042de1543001bc4492bb22d83fd951a97e6be18e6d29a1ed2277be3698ac6bce