Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c811dd83f06f62f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 10:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a467a288047e97a9dfd927a6e8dd22d SHA-1: 0641fdf3f31c1e04fe7dc44a5e41d6dfa118f5b6 SHA-256: 6c811dd83f06f62fa5b8c0cafb2590c7349483152022c466fcf2a8d9c51a572a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=parallelogram+is+a+trapezoid PDF link annotation
    • https://all-stage-meditation.tw/uploads/files/6100426d06d9f.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07dc80222---42282233526.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4977bf47b---44413229227.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021042913582673499.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/46221881869.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/83822931533.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16106a47433817---31575162737.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/gonetamaxunafobizavog.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/sezitareteroxi.pdfIn PDF document text
    • http://quaint-house.com/56614804476.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/watoti.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/16726134401.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/nupifejaramusude.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/fifakixegakuwikuruwo.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/3630997257.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/5gqjajsa6l88vkdc3v5k625vl1/89150097577.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/80963628374.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210725_4839C50EA949A348.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/kezef.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/4rdc5cg71f0eo58eb8uhdm25os/bifuwikuviwadage.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7f3bd5db2---42871478866.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/mopovek.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/16224095990.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 17560 bytes
SHA-256: 99fbe78565813f41df64ded380e6646d383d23df9cb79490c136c77ea1fb0333
font_01_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 10692 bytes
SHA-256: ea6338e2776d3001a60f970545e3393171abbcc5bca5e197127fcaae0fffe7f1
font_02_sfnt_off00011f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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