Malicious PDF — malware analysis report

Static analysis result for SHA-256 27843095785a0b3f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 16:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8381b8cdf21d85d12112806a8b547297 SHA-1: f34aa7d8d275bc3a2e9d6aa9dc1bde6cabb6b369 SHA-256: 27843095785a0b3f2c56339d22983ff4266491b3bbe6e2664f49a1d41df5a0fd
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 potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using such links for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://autopsrus.aerovents.com/ckfinder/userfiles/files/kanefexerunujew.pdf In PDF document text
    • http://aktifithalat.com/resimlerfiles/88812259717.pdfIn PDF document text
    • https://hirurgija.me/files/zugubavumukuradadadoranug.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fef1d87eb---legag.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/fufapizedigovorumesib.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16133a6f2885b8---lewilexaxurujolatalom.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/wupok.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/dosujupadutijogenuz.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091710480352.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/15457048558.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/xaziberurikeno.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/88217597538.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/pomifevareropodunin.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/88215440811.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5136b7e2---redejetenisobupu.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/34921434030.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/kotuvamelaxasega.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/1284236528.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/bagutisekogojige.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/41465720897.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/wiwelagixapodetexaroto.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/babusi.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/gofitibadaneretatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+free+compass+app+for+android+2020PDF 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_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 18676 bytes
SHA-256: 84f3cef25be2b70916877f3c05a1fdc356fdcbaca97889add3e5489f00d2f5d4
font_01_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 11032 bytes
SHA-256: 90a9163ee0c15863bf73334abe9b6a43f1dd3ff1775f76010040f6c0462540cb
font_02_sfnt_off000122d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1