Malicious PDF — malware analysis report

Static analysis result for SHA-256 652752424a23634c…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 16:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c625dd946aba250b747cc0218b200c5 SHA-1: 45c5af24f159a6038780363ccd956a106223da42 SHA-256: 652752424a23634cb94292d65eb45ae9986a15cd3ebed1b6c509d99a96d219c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to facilitate the redirection to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=minecraft+pe+1+16.40 PDF link annotation
    • http://dtyxbpzx.com/filespath/files/20210908233155.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sidibasup.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/27545891634.pdfIn PDF document text
    • http://elsped.hu/files/file/peletofowulozakegavabu.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210908124442.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/67470404025.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358427c32db---98396788413.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/rufawotupu.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/vaxurebi.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/fipewezuminifetilawami.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/44921884343.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161347b65e0916---59566598447.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/zokuwosagegofile.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/sevikiwisopagoborigika.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/88805488529.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/26047407334.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1db103679---4522655118.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/duxutatujibisusoxomezowo.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/83503417373.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/2238470374.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/4tbt71md3redvt4dvsfa0cbpph/80627739844.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/gagusitixuzenaporaxupoli.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/38263489235.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/85847837556.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/18608999290.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/rovigoju.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/36522275513.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_off0000d454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 10616 bytes
SHA-256: be2da17410da8f14e0d656abf0e2c01fb93982b362b3501b24c91032a96a1c81
font_02_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 16976 bytes
SHA-256: 63da956fc1f48c2137cfc4325f8cc8f34dc4b49c68405c3d98d2c218147665dd

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