Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecadaa03e678cddf…

MALICIOUS

PDF

95.1 KB Created: 2021-10-17 06:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f4e1787ecbbe3b61571d19428bf7b16e SHA-1: ff163b1c956ad6e90755a94dd4f9b169d94ea947 SHA-256: ecadaa03e678cddfb5846f3a277051614f2c8fdd31f144e4ae607459f45a3d17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f8447d6d---5666226638.pdf In PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb3927f74---65232501338.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/92207805905.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/tudazererofuba.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/rowekabujemagafirat.pdfIn PDF document text
    • http://newo.ru/files/files/kotugaguxazivuxuvugus.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/93929580057.pdfIn PDF document text
    • https://rintrans.com/files/71776001396.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/soliwojun.pdfIn PDF document text
    • https://www.confirmedtour.com/files/nuzul.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/6060731498.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///39768339151.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/15091087561.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/91192708380.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/polevarekop.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/55289106320.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/zubekeler.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/foboliwumetixutate.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/fakogevenobe.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/kanadof.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/folanekegowadadebekexexe.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615fa128e3e9f---zurejejixapanumulokopezom.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=go+off+the+beaten+path+meaningPDF 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_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 21020 bytes
SHA-256: 082ad9aafd2ac962f6215259b62fefa19e6ec86c06e981fcf9f927686f63c07c
font_02_sfnt_off000156e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E0 10668 bytes
SHA-256: f32f3f49cd9e42d5752bf8f24396cbeb2031c6ac3ee3e4c1d9e1671420fa80ef