Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bd778b4994d773…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 16:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5fd57acfb48ae4f8ea6e9e277d35857f SHA-1: bf4b87f8dd5c779873c01d72328e2bb3763d9cb2 SHA-256: e9bd778b4994d77391b7adf206ce7f027642506e027d8bd6d86c403f689b7c13
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The primary attack pattern observed is the use of malicious links to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=asuhan+keperawatan+anak+dengan+retardasi+mental+pdf PDF link annotation
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/tesomut.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/lopitituxudotezomowobim.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d1a8357e4---talab.pdfIn PDF document text
    • https://toocapen.com/files/molaxelanol.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/mobafivovizozoto.pdfIn PDF document text
    • http://wdnederland.nl/file/38959421084.pdfIn PDF document text
    • http://mid-europe-ex.com/42659976933.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/t2s1vqu4u5q388iaj762s8q5e6/lomosujaloxepo.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082446d104cd---boveb.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/i00nid9ihe9puivnb9pbn63dn3/21608549887.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/virebezu.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/pivogorade.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/55283650724.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210621_BBD1FADA0E584C2D.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d0a6bd2c5a8a110cc93a63e9c910595c/6883782139.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/8672c18e75377d5c388c40ee6e47def2/nokowino.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/rufozojegadalorabide.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/69489481438.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/kotuwobod.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb52db99cb6---51835912807.pdfIn PDF document text
    • http://prestopc.it/upload/file/44373667439.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843e80c08ed---bovodegixovikifoxe.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084984aea7a4---mipevefupakofup.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce273d5fcbc---kakizipa.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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 17952 bytes
SHA-256: 08691066296d267f80fc7e75ba8528e158f6f7102093507ba53efc7b71248eb4
font_01_sfnt_off000110fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 11084 bytes
SHA-256: 1984fbe67123c392036f39d3506ea99fbea10cc17e64037a414f65008e478ca6
font_02_sfnt_off00012a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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