Malicious PDF — malware analysis report

Static analysis result for SHA-256 279ca94be48cd801…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 22:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25429bb50289a8c883b8b35652355e50 SHA-1: 9c9339d646b87e77968130b7f7171b4266da8087 SHA-256: 279ca94be48cd8010735f912f6a3fc9f13485984c5356a685866b0e139463f49
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF structure are consistent with a malicious document designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9276126198---texegotodixupikup.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16070bda42b9e7---64318347973.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070362b7d657---milura.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/31bdc487087c54f1698b2886572fa294/28680185587.pdfIn PDF document text
    • http://luatsubienhoa.com/upload/ck/files/xamisezorudexexo.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/fegufapokasujemixafixebam.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/809d05d2535546e2aadf514028c2cfeb/kivaxat.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/bokidejoj.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210828_045112.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jaqt8aod429u453kkogd93ph0t/lunekatenumetosasof.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/98449588692.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/66007759765.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/pksash9jvnab7effh481nt0c4j/27601591386.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/2e148aac7d6052a4d123fe6ab99efe43/felaperuvub.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/16397425598.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210624_084208_4371.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7add7b151---zapabekowir.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/bakobekibagalovoxag.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/18458415008.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/kakogikowabepake.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f36c8e4a92---4207744733.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a9657e67---latos.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/24450268488.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/54427109848.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788489f38c4---zodizogagalalekegikun.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc70c50a5---99646896755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=plan+de+marketing+estrategico+pdfPDF 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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 11056 bytes
SHA-256: 2fcbd6feb71061e8e4433e13147cfdee72a7ce7277c5b05a04827f77cf6d8cea
font_01_sfnt_off00010822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 17656 bytes
SHA-256: 544972f4fed8ec71097aa6ba008e9001a977b6361de16e6773d06694a397bb95

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