Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b70be1a799bd861…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 06:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb53c5dba927301fbe84bb864401888d SHA-1: fbc6986771ce9c93b91b80824328aa5522cab744 SHA-256: 9b70be1a799bd8618f07f75f8fc50aa2d5b802c7037514469dbadd342f2aa1b0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest a phishing or malware distribution scheme, aiming to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://inwebjor.ru/uplcv?utm_term=if+clause+type+1+exercises+with+answers+pdf PDF link annotation
    • http://bscsaoner.in/ckfinder/userfiles/files/fowafusugomam.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160977aeb2b767---fofuwapi.pdfIn PDF document text
    • https://silga.ca/userfiles/file/13946324665.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa20a87a6c---94000238538.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/52928811601.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/dujopolomikam.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/vipebewusemazexodulokol.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d76a127b0---vewat.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecb5dae87c2---munisomorubokimokesobumov.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621005211.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/xowowavowinajanorunew.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/10636586276.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/94912176.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63b505939---bekufuluzaxapu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16084fe2fb1a37---gozesanagadu.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/paxoligidipiwalafozewu.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/36150195225.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/32702910406.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210724_1D11C6D34F94C7F6.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad9bb8105---51581480221.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/40570089040.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/46950799601.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_off0000ba73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28A 11000 bytes
SHA-256: 5e9463ed344d215d4d34bc7d0ede21235cc63aef99bed09baed05af8776cc449
font_02_sfnt_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 19916 bytes
SHA-256: bd75a2c8c7d733fcaae220c5c37ea4141e5df522cc3539d190611a2c89e900ab

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