Malicious PDF — malware analysis report

Static analysis result for SHA-256 908d3e363a61726b…

MALICIOUS

PDF

72.0 KB Created: 2021-10-03 14:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 192148f7601d14ed43343c4b86c7a206 SHA-1: 5edb1969ae500dd7c191c956d3d7f67d9b992d95 SHA-256: 908d3e363a61726b892d4882cce379a8583ae771c753e5fa151c587a627d2351
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://vitacanes.com/uploads/files/1311782993.pdf In PDF document text
    • http://robbymakka.com/userfiles/file/92235126334.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f3e86088e---30427417013.pdfIn PDF document text
    • http://cplust.com/upload/serback/files/20210925045905.pdfIn PDF document text
    • https://recrut.com/files/files/33366984033.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/bokiludulanedijoniguga.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/mudesebofukape.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/xelerabinoregogumala.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/96994205998.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147181f6e7a8---49822589597.pdfIn PDF document text
    • http://ip-kamery.cz/files/file/42772233641.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/98516735526.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/sodesepepudolirikafolexam.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/86160905850.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141627f2d56c---38939310183.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/93393082252.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109281603168710.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/vivufitowofoxugaredu.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/91133617904.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/sudanojupoweza.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109161336491705.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/gds903o943dq621v91oivr747o/63826034930.pdfIn PDF document text
    • http://techbis.pl/files/file/37265847674.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210917225515.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/36749981934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cbse+class+10+science+book+answersPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/62454918812.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_off0000b4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 17856 bytes
SHA-256: 15d99987666640c1571fe5ee0aba566eaa7584ba26f71eef152518fc64d315ca
font_02_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 10648 bytes
SHA-256: af9fff02393b84cce4a527c4da8441726f71f9e37adc0873365445f52a45c355