Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c1ddf42b417ed8…

MALICIOUS

PDF

89.6 KB Created: 2021-09-22 23:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aca2e0aca276f6df850fb34227ac4a9e SHA-1: a76650fa51702ad47d9c996462895334596f99ef SHA-256: e9c1ddf42b417ed81fde51e48f4a5e1a4a9be22b8bd3467a315731b3bb0f4101
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://philabc.ru/uplcv?utm_term=after+we+collided+free+stream+no+sign+up PDF link annotation
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614252b709550---97369604315.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/10883781855.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/pivemuguwutuloluguro.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/50052607582.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/vuwodosadubimiredafata.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/13491190294.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/jonetafaxagu.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wizelexun.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/0fbaf51d4eead66db851779176431c8a/88979375645.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/40700574764.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/xejoza.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/tafozo.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/322919b5983962b357e053ef169b0833/kixaxopudijesetabaji.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149647372c6b---17768549772.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/zerabetovapabewifuximo.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/gofinisupamejebuzuxulomu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/63543061258.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/bulufuxebavusisewigi.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/85876209508.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/nikikufetovamum.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/53346553514.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/dexiwuduterujugamuropute.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/sojid.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_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 20540 bytes
SHA-256: 8aa21e06597bd3138ab780b15aea8279579ace23442bca139a0d32ef89a7d58d
font_01_sfnt_off0001267a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E91 11132 bytes
SHA-256: 3e43ef06e03b1ffc893af89156a4dee3fb2eec4f3a2ee5239fb8d507e03837ec

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