Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdf68055bfde378…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 04:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23638b7e940173bad3b4aca35a4081f5 SHA-1: d5a4994e4571f4c8627699cd901ae02b39bef984 SHA-256: 3bdf68055bfde37892c31b52a1fd81c5e0ae53dca9bd325cf087a26d1b5f17e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kaptenhoki.info/contents//files/23399380738.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608442564ba0d---51908223822.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/df46303017efa69a6062ee417a548b35/gimogejafu.pdfIn PDF document text
    • http://canvangdientu.com/images/file/fosalazamisejewusokowu.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/kuzululekoparewo.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/42072004738.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/jutakasumuw.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/wofufuxatumitulosaro.pdfIn PDF document text
    • http://kite-surf.sk/files/tiwowunudinojagojigeduw.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/47108544057.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4c8fc086585dc0d67b4cfa0d2b9ec019/16259766380.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/3337511476.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/24218757254.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/40716466762.pdfIn PDF document text
    • http://sy-smile.com/upload/files/nariguxumegamekigadizoko.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/nebaluzovakaxovurufobawi.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/42981341410.pdfIn PDF document text
    • https://digireg.nu/upload/gijifugene.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/bbpb6itbcfb37imo2cld6si5ta/xomep.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/rikewavufoxet.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/duvazebixir.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/a1558d00493ac4ad1d3b7bda4de75c77/jerizevitigadudivuvufu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/a700cl4f1qpgrrabaa7ofu2o26/lafuzogikono.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/fe5f4428380905d5a1ad829e0fac2048/lojitegufator.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=elementary+differential+equations+10th+edition+solutions+manual+pdfPDF 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_off0000bd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1C 11280 bytes
SHA-256: a15227c9e7abf883eb4510ea4ecc7fc5167ca07288640145f750a6343df28c56
font_01_sfnt_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 16720 bytes
SHA-256: 9ddfe93daccdeb6664d5897fe62a8cc0640da28c7e252e01188498fd2201e9d9
font_02_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1