Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffa294971b7b01e…

MALICIOUS

PDF

85.7 KB Created: 2021-06-29 11:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7db4b53d8bbad380d6f5dd19aa4fedd6 SHA-1: 6baac689ce1bda8b48647921b9e0195dc26808c5 SHA-256: 8ffa294971b7b01ec0a81fed24beecbc151303246f4e9ecf624011fdc434ddc7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of these links suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=knee+sliding+out+of+place PDF link annotation
    • http://alpha-th.com/userfiles/file/kotenipiwupezi.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/60424040541.pdfIn PDF document text
    • http://bptramptour.pl/files/file/51174209167.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/54311963545.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/32782907078.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcb645249f---37383528937.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/21408590144.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2b030ff6---66235321867.pdfIn PDF document text
    • https://altbuket.ru/files/19011741685.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/9b34893ed0ec36982c4d32fde6f46335/40374096268.pdfIn PDF document text
    • https://csn-alliance.com/data/files/masugolitizapofawuwika.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/26356760255.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/nitabavakunawabegipu.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///19204354863.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/e92481a273e21ae8a9e6abe29c7a18da/zulesosutod.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/92890005819.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f91c09cc36---40060151927.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/38872213505.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b25a98968152004e9c00af7a10153dae/viwusegegumuxuvikiwu.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/68826830172.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f5ec270f4c5d0d28086f91148aa1a042/kovewubuvebikeworaw.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/fowidivumejipegakolefi.pdfIn PDF document text
    • http://teplospectr.ru/images/files/89491981471.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8d591776c1664375ca17575fb1bdd154/leluv.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7a744ede602b22b45e16f6f8a05f358e/48689318419.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_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 16664 bytes
SHA-256: 74076bdfc858b55bac2ee56f06b042d4d7ccbe666f7ac0bd9fcb2a04d6b375b1
font_01_sfnt_off0001188f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 10784 bytes
SHA-256: 2ec069ab32975c376c10c120e59c27ee5b85ce63f6f2633a8cf4598e2018b807
font_02_sfnt_off00013159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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