Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cdc4e418cebea6…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 23:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2030bfaf156a3ccab0b2e5ca1dd50740 SHA-1: d0ae65b8a8c92e137fb4a39bc9a9b9415a897d1e SHA-256: b0cdc4e418cebea68e0bbadae62d1f60a10f17b6cf7d2d5e415c2cf5742ee428
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, directing users to various websites, some of which are hosted on compromised WordPress installations. The presence of `utm_term=download+world+warship+mod+apk` suggests a lure for potentially unwanted software or malware disguised as a game mod. No scripts were extracted, but the PDF structure and URL distribution point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=download+world+warship+mod+apk PDF link annotation
    • http://splhardware.com/UploadFile/file/2021091719465573499.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/35792636381.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/voketajasigudile.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904190210842675.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/33805643197.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/naxafixujuxowopedipo.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/rojimogiruvevozebama.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/pajoruw.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/jakesidaribu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0552f889---28841089585.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614029a5b6fc5---60141146865.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/99023289818.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/zizovusapavivuriwexewafif.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/10490517359.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/laxubiduvoxofizemidasoxa.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/2721946288.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e1c790a32---18329726790.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210919014828.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/pikaposumevo.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/lezekaxil.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/29498727250.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/87600068787.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/28491082491.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109101525366540.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/77854138561.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/juwofakixijudof.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_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 19092 bytes
SHA-256: 4987245ff8707c54606279d806c917e61247ceaf875fa376f93c7057d9f3bf83
font_02_sfnt_off000120b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B6 10608 bytes
SHA-256: 165220fb9dd205492b2181959b6188075f9ecf9da5bde9d8dd34755e737f3bed

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