Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c4c452cfee6e8b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-09 02:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1b5d9ef8bb74f21a9aefe1482c02850 SHA-1: 663595255834f776398ea28d64e384fa0cb22dba SHA-256: b5c4c452cfee6e8bea330536709d3cbe1ed3c46d71fb50defa46d4217909b0f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nhatrangpalacehotel.com/app/webroot/upload/files/nitotowitedobufibijufaro.pdf In PDF document text
    • https://produktybhp.pl/pliki_user/File/nebaxubezokokipatotiz.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135e4c753a9c---xopenorukeniramenizamun.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/kukebovoraxanesedadi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/vq4udu40evs5th8efc31dfakpq/50436221400.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/kuninef.pdfIn PDF document text
    • https://akvaguru.hu/user/file/82823117842.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/xaretulusuzabova.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d249b74a9---radiw.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/kibafikajifotojinizo.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/6b672552c4d7473298af7ab96bdb8b96/93300658559.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/kekisonozaluluxoxe.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/vofiledogopijid.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/45665826348.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/ganewezinawinesituzozud.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/forototubaful.pdfIn PDF document text
    • http://www.moyekolodin.com/files/goruponadufa.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/36691090021.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/wuzebuxekoxuta.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/gadesupazujox.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090906380411.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/44659487094.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/wubupiwenikasomowoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+infinite+gems+in+hungry+shark+worldPDF 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_off0000b944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 11184 bytes
SHA-256: c4bef5d66b9ec013a9e663156a7c20e732f4ed78d3d31842de8339677b0de061
font_02_sfnt_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 16292 bytes
SHA-256: 530f0ede506068295186b9492f3329fec418e896fb46821fdef2ca4dca9ad514

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