Malicious PDF — malware analysis report

Static analysis result for SHA-256 404d1d458eb5f40f…

MALICIOUS

PDF

87.6 KB Created: 2021-10-13 13:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e1c5da5a8dce1ea55ba95549c4ac2079 SHA-1: b04dd197bd364a63ab8134976a12711a1a50ed9b SHA-256: 404d1d458eb5f40fb33b0d70ec1cb89ff8c5af597e34e90ce39774ddc0b53883
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The file functions as a link farm, containing numerous URLs pointing to compromised or disposable domains, which are likely used to host malicious content or redirect users to phishing sites. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://xindeshiye.com/uploadfile/file///2021092014460090.pdf In PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd6f55a53---96280929749.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/lizezox.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/8fd7669622a2f2ffde388f7f0a743faf/83922580662.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/19524090618.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/49205347919.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/89281708643.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/94501a3fd7c0c5cda435922afabb44c9/kemavokeg.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/7v753na0gmpf22hltutnaunm00/59060481555.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/mepegukijedizo.pdfIn PDF document text
    • http://93564497.com/userfiles/51337708269.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/sejaniludi.pdfIn PDF document text
    • https://dfkcnc.shopper-store.net/file/files/57815007525.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/80490729709.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/254e63d3ac8e67b1b34aac2668fae8ae/22199772546.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/58104944670.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/fopom.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/9067910799.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/girewo.pdfIn PDF document text
    • http://tdbm.vn/upload/files/kufiresebodakeravoto.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/52301234753.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16162058722a7c---96422696287.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090207171854.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/56920916994.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/44502325605.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/55116334703.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=olympia+valance+neighboursPDF link annotation
    • 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_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 11168 bytes
SHA-256: 68cdbb7370e3785bb91e3d2daf8ca8d9d1e8ceff87ae2d2bd572fb6a8e3c927f
font_02_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 19084 bytes
SHA-256: 96444c9ae5bd9e5be3ad1cff29eb5427881275991c61c356a0e3f7c155c0d424