Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b7d5e87fd86bc2…

MALICIOUS

PDF

72.0 KB Created: 2021-09-04 04:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d334a1f93ab1e9d60963944ada26ff9e SHA-1: 4c0ef4e15ed95827e56e44ce9fab67f8565d36db SHA-256: 08b7d5e87fd86bc2aba5c2d4278bbc82d7ba71bc3cf491a1e24d5c44c72492e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608b305eccd1b---jolavonisu.pdf In PDF document text
    • http://auto-spec.ca/fck/file/gadupadowumutezuporan.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160beb13fed0c2---5184482881.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609241f18e1aa---11389740883.pdfIn PDF document text
    • http://apvn.info/userfiles/file/38797299648.pdfIn PDF document text
    • http://fitviewer.info/files/file/gisemulamafunuxugila.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/17751068780.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/josatedunemilibuge.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/vf6n2q9ntqhgsie8cp10tu80ju/xilezuxibadozuvogu.pdfIn PDF document text
    • https://combrooncom.com/contents//files/jizuwukapuvepedezusoxopux.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a430a81eb7c0a2eb999e853ea3fdca5c/88191816139.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/lonuwumetufufegedaru.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/tokoxun.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7b719ad48---pefovuzud.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a519162b626---18808962038.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/12595496034.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c2c9120dc---ratazox.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/368aa2f30832ab4b7df1f0eec7924bf3/70520085088.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/49720709652.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/97351943955.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/rimixarosebeze.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/rvdo52mhh368u3ems018dhua13/16417314593.pdfIn PDF document text
    • http://skupka54.ru/upload/m/zadopese.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae219c07d6d---10682052389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=queuing+theory+in+operation+research+pdfPDF 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_off0000b90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90B 15692 bytes
SHA-256: b6c9af5df0c41a0a1467ac20362ff3dbc4b638a9714bde1d8c9b8f0c37b9a174
font_01_sfnt_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 11124 bytes
SHA-256: 20ac6e64459b2682036c114eb1b8a7d4a1d4d8c0247facf2c3e4e0cb155c9fb6
font_02_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1