Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9d4e830ac906ea…

MALICIOUS

PDF

97.2 KB Created: 2021-09-23 08:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3efd1a772fb1d81c55391aec60ea55a SHA-1: 4e4d0a4b25b166f343b5740fd6116e4a1d26b04f SHA-256: eb9d4e830ac906eaef906385aef58d692646dccaadefa0ea4507669800307aac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms on disposable or compromised hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=ml+apk+mod+unlimited PDF link annotation
    • https://rhodium.vn/uploads/news_file/70350562269.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/6308589551.pdfIn PDF document text
    • http://travellerisland.com/files/72030188045.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/45113910284.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/79852978746.pdfIn PDF document text
    • http://dmkert.hu/files/file/74864455240.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/mebegewokodaropopemir.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/98860566032.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/56260109840.pdfIn PDF document text
    • https://sambelteri.com/contents/files/rasimejupop.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210917205806972.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/mananov.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/mirogedijevotefogun.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/galosoturek.pdfIn PDF document text
    • https://vientangluc.com/upload/files/37170655753.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/56929909329.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144da7b857ab---zemifopolinag.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/99662284234.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd6e3d231---tubeniru.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/dedujij.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mewezajivosupazumisawuw.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/pogofuximuvufojafedu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56f2ac590---1510238444.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161346e206a8bc---wewemumujuv.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_off000117a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A2 10468 bytes
SHA-256: f7257bf7eb639f51c96a728c8be15606f8fcd394e5fc8e83ed4730fd66bd590d
font_01_sfnt_off00012f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F58 18468 bytes
SHA-256: a1416d1812af58a2e4dc59c279f1da2c173e1d868e204eb4386fb3fc38a7f7fd
font_02_sfnt_off00015f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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