Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b636297e5f0404…

MALICIOUS

PDF

73.5 KB Created: 2021-09-02 07:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2a4ba2d021621554c0bb5218f7763860 SHA-1: ca476c87d3d6237970c84294ac815cab9ce0a72e SHA-256: e2b636297e5f0404a6656385d636227c1e9c6620ede4d540bdf5f6649cd62dde
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://btfa.tw/upload/files/23309939943.pdf In PDF document text
    • http://galaxyjewel.cn/uploadfile/files/xeluwijitaxejubiviz.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/45962660658.pdfIn PDF document text
    • https://heyratacademy.ir/file/bunozomomanujojix.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74d2e4399---31832592550.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/fe8aff2d2598f1ddbe02bf95bca051f4/53691572211.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/59150669146.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d6fcebdd1---50654335361.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/falasilijuzulu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb22a1713---82168539224.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/dogidokiwiteperadidiwafig.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/dovimi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b325aef34b5---57744535612.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/zusawizakekub.pdfIn PDF document text
    • https://fototipia.hu/files/files/bizubu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0caaf176ac---99501494208.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/51083519766.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/72fc2dsk64q5kpi190fccpb913/93287058383.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/pezuzidi.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/5940cutdsn9l4p5nrlvbgjcmnt/senakuvoxazidazisi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/63d4ecfe68677fae557b14e3c66752a4/2831389811.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/54917863563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=review+of+literature+of+solar+energy+projectPDF link annotation
    • 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_off0000c00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00B 11196 bytes
SHA-256: e44a1407d098cd3424e07a99d9be48df1252938933f596dcf2baa0fbe7494343
font_01_sfnt_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 16600 bytes
SHA-256: 14133ee7adf4ae9e63ee5d3a6b7a73662df43cbecee3bc6a75d438dd2eda6a0b
font_02_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1