Malicious PDF — malware analysis report

Static analysis result for SHA-256 910ceff881453ec9…

MALICIOUS

PDF

110.2 KB Created: 2021-09-19 13:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1fd7d1013edc43263f3f9bb5a07aac73 SHA-1: 8db87fbc4b4bff094402c9132524b6492608459f SHA-256: 910ceff881453ec915c6f9701123f97c7feb42a393c480f7ccc770afc2a598f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://heatexchangersolution.com/upload_fck/file/2021-9-19/20210919130729703353.pdf In PDF document text
    • https://namhunglogistic.vn/site/files/75700717209.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/nitexufokuzudobifokod.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/99534346023.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/63821118557.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/152353172945.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/kiburudigipusolarivo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612edefcad865---lababefebotepivi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613043dfa00fd---89889856490.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16143a372454df---didog.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/88294808616.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143836e2ff87---87657070555.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/fegofifazigizubogu.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/23472627311.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/mugolixorojarive.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c11a783601---53207420745.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/35059826968.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/zujanepuwema.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/99413640458.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/40505875881.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/rexununotiwuxadunuwujeve.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/fibakotalawewevaro.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/6003678273.pdfIn PDF document text
    • http://packamate.com/userfiles/18387503711.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/05a7256ab003de207bf91829eb0d5786/81884331784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=dante%27s+inferno+ppssppPDF 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_off00014b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B24 10340 bytes
SHA-256: 5101d36365edda225e5d405ae479706469c7ae2218a002163272319e6585583c
font_01_sfnt_off000162a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A7 18396 bytes
SHA-256: efa1db6212315ea7a22412265d8acd4313ede462bf564e09d3100df5ac81c091
font_02_sfnt_off000192cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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