Malicious PDF — malware analysis report

Static analysis result for SHA-256 9295e8f0055392d3…

MALICIOUS

PDF

85.8 KB Created: 2021-09-21 08:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b6dfa77d5d130a86b0c8a8ba6a086a8 SHA-1: d524af1937494c8ebde02b35804223c9ab2ecdc4 SHA-256: 9295e8f0055392d3256e9c560c04a8fef0ceaa1d34f92df2d7aa9cd860af0d15
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 disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=how+to+listen+to+past+calls+on+android PDF link annotation
    • http://ayurveda-shiatsu-nice.com/upload/files/ruxakatefafukiwenu.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/kizokad.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/8115991880.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a806beccb---31864886392.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/49844199531.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/96683670054.pdfIn PDF document text
    • http://creationart.hu/files/file/dasoves.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/96261653867.pdfIn PDF document text
    • http://asfalon.com/__files/file/82416498733.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a91e22a073---41447863465.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/tibelupafukokisovoxokepup.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/60131759179.pdfIn PDF document text
    • http://zl369.net/userfiles/file/61973658569.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/26458948891.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/minatuvijodosif.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210905/0059456102.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16145c7af48f9f---6222843854.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/difibupevutusitozab.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/59589621054.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/55762835211.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/jinumulatixiba.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/dujiludezizafazurenev.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/bozulefegulevebupaso.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021092110171273499.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_off0000eb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 17492 bytes
SHA-256: 97f97d58a9d7fdad2414942a5beebe8238582af8694c26b47db0f7f2d0d67535
font_01_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 10584 bytes
SHA-256: ee46758c1b043068dbeafe11a965492ca72de861173aac715f83fc507f9f9af2
font_02_sfnt_off00013121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1