Malicious PDF — malware analysis report

Static analysis result for SHA-256 484dcc55978d0bf3…

MALICIOUS

PDF

99.5 KB Created: 2021-06-28 14:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d8c62a20035ad65c0d7c3d1dd366084a SHA-1: 48932ddb28a16197b386efc68cd64eb67bd1582b SHA-256: 484dcc55978d0bf3f6946383eec046db52907409c1a80a061d8e96c9a335e8c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using disposable hosting for the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/92c88c33f61ae7598290f8d0fd21296d/bamozokuzexadotulebo.pdf In PDF document text
    • http://amadpich.com/userfiles/file/bonamotuletisopafeximomip.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/qno5d2pvokf728cicdg6123fhb/41779455019.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/siwudokijopexemomani.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e8abb371a---25308003155.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4044b6ce73---51667832479.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c95defeaed1---gagepam.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/12b5dc97bfd87e8bf80beebb2a345b7a/zukenukijopukuf.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6719ff54---bisusorusimegavok.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/44432507506.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a846eb36f48---9911876668.pdfIn PDF document text
    • http://uci.ir/userfiles/file/robomazepomijil.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608132962b730---56142263661.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/65132511dd76031478180f6d9dd8734c/27409518245.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608749f8b7e58---newojepamiwi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b9730a72---69074192414.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/73d6ae080e25db8f17f6a983fe362185/ranagori.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/24598697377.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/pipeb.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/2483152458.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/61049f3db5220c2ae086f13bc75870cd/86884858258.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/caa890ca308575605c7dddb64e0e48a4/nofineneluvaribexiwexuzi.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/eccef6fb489fe11f0f3055e47060c246/janew.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bac069dc1ff---tamumepuvirosidubisi.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/tivozaguv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+the+area+code+336PDF 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_off00012526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12526 16444 bytes
SHA-256: 05961981df74309bb149bd2b5863adc638a3b993c770e109aa0afd2dcebe7b86
font_01_sfnt_off00014fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000167ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167EF 10648 bytes
SHA-256: 9fa554953460251007931fe68b8896988830659ada4b99dbf7485e626d648330