Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6b678554a86028…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 17:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 162c833a56f17da317cfec5c58b86a2d SHA-1: f4b82fbb30d53d1ef41be5f1a66fc80c6046045b SHA-256: bd6b678554a86028a852430542b9fbdbc799283afed00fac60d657af3cd4b074
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c0fe035a---70461821253.pdf In PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/lalorulejigalikawet.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/purotamevetikunava.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/38946163157.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609090ce1528d---66002712790.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/jitiwerepewipajasegazis.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/77322841825.pdfIn PDF document text
    • http://hotechike.com/files/files/13712968338.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/2020227886.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/88761559131.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609aceac7b51d---jazezijumafoxulejamotufuv.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/xusisorenadewosedegirupa.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/62433162436.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210808220540.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/16692411853.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/lilawijekukirurutaf.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/43383192491.pdfIn PDF document text
    • http://midel.me/userfiles/file/nekivizijaf.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/pilokogoxebi.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/tesedowikimufedinuvij.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7505e7329a08ecaa547777e37b86f80a/42769246028.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55f71e57b---84747530003.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/14551162473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=subaru+forester+repair+manual+2005PDF link annotation
    • 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_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 17484 bytes
SHA-256: aca66333df4db719b224eaf7a762f94d4de2b09440478c4f4949d8dda6461fa2
font_02_sfnt_off0001370f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370F 11212 bytes
SHA-256: 0a46e03f43b4ac733109c4b06e2752ea5a50d290013aff4f76bcca19601aff9e