Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b4fa9d2772d19a…

MALICIOUS

PDF

73.8 KB Created: 2021-09-15 12:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e921f3a59dc6e2b4c41b3294a05de97c SHA-1: 8971b1ca377c87c44f440033325a83e24e24ea0d SHA-256: e8b4fa9d2772d19a02d8fad4ccb39d480e1ccb17ed0bd1f97f2fd03750f16c3b
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms on compromised CMS uploads points towards an attempt to leverage these sites for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=dream+league+soccer+2019+hack PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/adaredt4183nouljcvn7sv12nv/dimilusumurabaludemapol.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a79c535f83---nuxijugexigujeburilid.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/gadorajofujogisak.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/pavibivobozajimabasofiva.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/lativu.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/bopaperejadeza.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/8681001203.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/zabomabadikonotumavepejo.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/33477817897.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/88329485023.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06aa0e7ac---47647868346.pdfPDF link annotation
    • https://oreopay57.com/ckfinder/userfiles/files/zigakuzufo.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/56741387283.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/rsj2e7ic2dc5pvgao7tmsiveli/bukewa.pdfIn PDF document text
    • http://llux.vn/uploads/files/kadoladosazisasifob.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/kipipazixorenaxewezajugar.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/jivilasovebaturorewav.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/ginedorileku.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/vosuxoxirufoposofazi.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/gixer.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/jevojevidibizufumi.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/68232188757.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/jufofuvexofepunemuxi.pdfIn PDF document text
    • http://nenorm.com/files/files/xisinat.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_off0000bad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 11036 bytes
SHA-256: 7e90c020453ce95594a170a7634d09cb5918e8b2c0c11f5f4fa9841f148a2a10
font_02_sfnt_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 17492 bytes
SHA-256: 9a95d0e8bc15d1ae16b163b0b065bb3859d3c627751db5038990a9126c10209c

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