Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c011359d08d5386…

MALICIOUS

PDF

80.8 KB Created: 2021-08-30 21:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7206abaff850db3b195d8f3360f2d8c0 SHA-1: ff21c613f0738d40c0a7b20f4befb219ed4fc414 SHA-256: 0c011359d08d5386355cc42a7a54f57d788eb4a82cd23d28efffc0f22c5f6e79
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://iwanbim.com/userfiles/files/75818621507.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/86726395464.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/zavinodibugosezunemol.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/jotopividuvesixepumivexu.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/wimidameleg.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/9toac5vk998lc8bg7mi66piscu/gupolesukexokujawotiv.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/lidetakomilabuturanomedib.pdfIn PDF document text
    • https://anakmeong.com/contents//files/moliwuwijotitejorik.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/69359809836.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/xukolu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a268da57a---94783545137.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kugoja.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c76c6e595e18a11e1f0e30d5ecd20083/84224365515.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/6297030353.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/577e6717323e9c14ec1107417dfe668c/52303486034.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/gedofamunezagut.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/38763373612.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/aqh5f0ueg80t1se72ql3l4knd6/77819097467.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/mtesq1me18hr9v69n79k243k55/zefebunexisapujegu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607193b2ed781---tezizuledutugukagopuresa.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/sowumapurazutepalev.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/18882419763.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/77897120603.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa4f83af36---42843964942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+alchemist+answersPDF 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_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 17884 bytes
SHA-256: 9122fe791723c1c5f6778f5f58eb6715eb16f96d5c051d9cfbc3d17cb9e08697
font_01_sfnt_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 10424 bytes
SHA-256: 431037b6da76cacc37ff695805eaf26bcb0acd53f197342d08c065afd913930b
font_02_sfnt_off00011cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1