Malicious PDF — malware analysis report

Static analysis result for SHA-256 3080bb9f3863cbc3…

MALICIOUS

PDF

92.5 KB Created: 2021-09-02 10:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9d1d5a4220b565c9484c02a9b6e6faf6 SHA-1: 2de41350a76a835004c604964bc5baa04c8622ed SHA-256: 3080bb9f3863cbc3e0bb970ced6c415b5081a3cf4df54cc36d6598e01784c257
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.lire-les-notes.com/ckfinder/userfiles/files/xasusatudebelopipiralig.pdf In PDF document text
    • http://at2apigroup3.com/contents//files/94594124797.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2a234e9cc914ba4e8a6c8fef5821bd11/90558059290.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a97492af8d2---94082368298.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/xefujezi.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021072000021873499.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/vizurofo.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/zujagup.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6d50862fc45e1dde97f2805d7f5ac99a/9327285672.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/zigixenixixiverulifeza.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/97640708194.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/jorefifaxijupuva.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607364e000570---34206141144.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/24033603293.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878e234e4af---39923184397.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/21239782263.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d244ee57cc92be9eaaad43ed82554db3/fudezejitifimebitoxegapu.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd31ae247---xunekiputegilufuvipomet.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b481ae444debb49d35f1b3fb9570de68/pezep.pdfIn PDF document text
    • https://airshow-bg.com/file/12829320441.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/vaxawedugelomew.pdfIn PDF document text
    • http://leton.pl/userfiles/file/2426010557.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adedf2a15ec---81999937513.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/30323200088.pdfIn PDF document text
    • https://noddy.nu/images/file/tawofelorebifuzonebeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hawaii+state+id+requirementsPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/3324048321.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_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 18016 bytes
SHA-256: f182822ae28fc10109ff1c881c7e4c5ee7217125dfa46da6d4a7059d0c03086d
font_01_sfnt_off000133cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CB 10564 bytes
SHA-256: a9616fceac20a6246d625c6094921dcf09f0337102c91df3bd874a359513c0d0
font_02_sfnt_off00014bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1