Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edc72ccd62a5e3c…

MALICIOUS

PDF

80.5 KB Created: 2021-08-08 13:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b239aa5964ba75648e43f8aa9a5ad80 SHA-1: b9e14f0dd941dc7ac023b5bd5202ea3ec066aa29 SHA-256: 5edc72ccd62a5e3c38642a033b5bd077c26974898efd1bfe5a249eb2643e40ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825108b6753---fojukulos.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7968f4f783---vusexedivenurakuluve.pdf
    • http://atol-res.pl/uploads/file/90072229972.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c7dd3a301---pazunikumegegixe.pdf
    • http://americandeliorder.com/uploads/files/34702009637.pdf
    • http://automsystem.com/UploadFile/file/20210617120551182.pdf
    • http://nbnjl.com/userfiles/files/gaporunakuxodisilijuve.pdf
    • https://erdemlerkoleji.com/resimler/files/vonudiwugajetoberavevus.pdf
    • http://sarljarry.fr/userfiles/file/27439052945.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/13491936676.pdf
    • http://fuga-hotel.com/CKEdit/upload/files/42637391642.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099fc46e1859---ketipifofazajanesetuwuzi.pdf
    • http://china-zzld.com/uploadfile/file///2021062108001412.pdf
    • https://reklama71.ru/upload_picture/xuzafozinaga.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86de6b2463---3100804438.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/maoe4jmcf5nvovl8d3jf7le5v6/perixaxutomidoromazojo.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6ca7b133j28a6ojhdc8964i607/22384826903.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e84139af9---bovukidojezabejuwu.pdf
    • https://beaszemin.com/files/20035645382.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48318ab52---15701526163.pdf
    • http://www.asslar.de/downloads/xepufigamuwanasugiketub.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14a0e361d---mudik.pdf
    • http://www.childofafrica.org/media/userfiles/file/bisakexafale.pdf
    • http://17njl.com/userfiles/files/92136635054.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/nhtvkrcgep66ehop3561nm61i6/juluxujomekidal.pdf
    • http://dongamold.com/fckeditor/upload_files/file/28011111464.pdf
    • https://learn.susd12.org/plu
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+elevator+story+plot+diagram
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bd.bin
1a3dbc12c303ee0f5a38b0073c030b9f82b78c6a54def73d20540f600c0ecfc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 16536 bytes
font_01_sfnt_off0001004d.bin
efa01509588711a6143abf6fb05314574e07ece8fa0cdb913d85a4cc8494f41b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 10880 bytes
font_02_sfnt_off00011950.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 16792 bytes